UNIMARK GROUP INC
SC 13D/A, 1998-07-23
CANNED, FRUITS, VEG, PRESERVES, JAMS & JELLIES
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 1)*

                             THE UNIMARK GROUP, INC.
                          ---------------------------
                                (Name of Issuer)

                     Common Stock, Par Value $0.01 Per Share
                  ---------------------------------------------
                         (Title of Class of Securities)

                                   904789104
                              -------------------
                                 (CUSIP Number)

                              Stephen M. Vine, Esq.
                    Akin, Gump, Strauss, Hauer & Feld, L.L.P.
                               590 Madison Avenue
                            New York, New York 10022
                                 (212) 872-1000
             -----------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                 July 17, 1998
                           -------------------------
                      (Date of Event which Requires Filing
                               of this Statement)




If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule  because of Rule 13d-1(b)(3) or (4), check the following box [ ]. Note:
Six copies of this statement,  including all exhibits,  should be filed with the
Commission. See Rule 13d- 1(a) for other parties to whom copies are to be sent.

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter disclosure
provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).





                         Continued on following page(s)
                               Page 1 of 87 Pages
                              Exhibit Index: Page 9

<PAGE>

                                                              Page 2 of 87 Pages

                                  SCHEDULE 13D

CUSIP No. 904789104


1        Name of Reporting Person
         I.R.S. Identification No. of Above Persons (Entities Only)

                  MEXICO STRATEGIC ADVISORS LLC

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [ ]
                                                     b.  [ ]

3        SEC Use Only

4        Source of Funds*

                  AF

5        Check Box If Disclosure of Legal Proceedings Is Required Pursuant to 
         Items 2(d) or 2(e)  [ ]

6        Citizenship or Place of Organization

                  Delaware

                           7        Sole Voting Power
  Number of                                 5,305,500\1\
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   5,305,500\1\
    With
                           10       Shared Dispositive Power
                                            0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            5,305,500\1\

12       Check Box If the Aggregate Amount in Row (11) Excludes Certain
         Shares*                                              [ ]

13       Percent of Class Represented By Amount in Row (11)

                                    38.06%

14       Type of Reporting Person*

                  OO; IA
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
\1\ See Item 6.
<PAGE>
                                                              Page 3 of 87 Pages

     This  Amendment No. 1 to Schedule 13D relates to Common  Shares,  par value
$0.01 per share (the "Shares"), of The UniMark Group, Inc. (the "Issuer").  This
Amendment  No. 1  supplementally  amends the initial  statement  on Schedule 13D
dated July 7, 1998 (the "Initial Statement"),  filed by the Reporting Person (as
defined below).  This Amendment No. 1 is being filed by the Reporting  Person to
report that as a result of an  adjustment  to the  original  arrangement  as set
forth in the Letter  Agreement  between the Issuer and MSIF, as described in the
Initial Statement,  the number of Shares of which the Reporting Person currently
may be  deemed  to be the  beneficial  owner has  changed  from that  previously
reported and that the underlying  transaction set forth in the Initial Statement
has been  consummated.  Capitalized terms used but not defined herein shall have
the meanings ascribed to them in the Initial Statement. The Initial Statement is
supplementally amended as follows.

Item 2.   Identity and Background.

          This statement is being filed on behalf of Mexico  Strategic  Advisors
LLC (the  "Reporting  Person")  and relates to Shares and the options to acquire
certain  Shares  (the  "Options")  held for the  account of M&M  Nominee  LLC, a
Delaware limited liability company ("M&M").

          Updated information concerning the members of the Board of Advisors of
the Reporting Person is set forth in Annex A hereto and  incorporated  herein by
reference.

Item 3.   Source and Amount of Funds or Other Consideration.

          M&M  expended  approximately  $14,998,706  of its  working  capital to
purchase the Shares  reported  herein as being  acquired since July 7, 1998 (the
date of filing of the last statement on Schedule 13D).

          The  securities  which will be held for the account of M&M may be held
through margin accounts  maintained with brokers,  which extend margin credit as
and when required to open or carry positions in its margin accounts,  subject to
applicable  federal  margin  regulations,  stock  exchange rules and such firm's
credit  policies.  The  positions  which  may be  held in the  margin  accounts,
including the Shares,  are pledged as  collateral  security for the repayment of
debit balances in the respective accounts.

Item 4.   Purpose of Transaction.

          All of the Shares reported herein acquired for the account of M&M were
acquired or disposed of for investment  purposes.  Neither the Reporting  Person
nor,  to the best of its  knowledge,  any of the  other  persons  identified  in
response to Item 2, has any plans or proposals that relate to or would result in
any of the transactions  described in subparagraphs (a) through (j) of Item 4 of
Schedule 13D. The Reporting Person reserves the right to acquire, or cause to be
acquired,  additional  securities  of the Issuer,  to dispose of, or cause to be
disposed,  such securities at any time or to formulate other purposes,  plans or
proposals  regarding the Issuer or any of its  securities,  to the extent deemed
advisable in light of general  investment and trading  policies of the Reporting
Person, MSIF, Madera and/or M&M, market conditions or other factors.

Item 5.   Interest in Securities of the Issuer.

          (a) The  Reporting  Person may be deemed the  beneficial  owner of the
5,305,500 Shares held for the account of M&M (approximately  38.06% of the total
number of Shares  outstanding  assuming  exercise  of the  Options  held for the

<PAGE>

                                                              Page 4 of 87 Pages

account of M&M).  This  number  consists  of (i)  3,305,500  Shares held for the
account of M&M and (ii) 2,000,000  Shares  issuable upon exercise of the Options
held for the account of M&M.
 
          (b) The Reporting Person (by virtue of the Advisory  Contract) has the
sole  power to direct  the voting  and  disposition  of the Shares  held for the
account of M&M.

          (c) Except for the transaction  described in Item 3 and Item 6 hereto,
there have been no  transactions  effected with respect to the Shares since July
7,  1998  (the date of filing  of the last  statement  on  Schedule  13D) by the
Reporting Person and/or M&M.

          (d) M&M and its members have the right to  participate  in the receipt
of dividends  from,  or proceeds  from the sale of,  securities,  including  the
Shares  and  Options,  held for the  account  of M&M in  accordance  with  their
membership interests in M&M.

          (e) Not applicable.

Item 6.   Contracts, Arrangements, Understandings in Relationship with Respect 
          to Securities of the Issuer.

          The terms of the  arrangement  contemplated  in the  Letter  Agreement
previously  described in the Initial Statement on Schedule 13D were adjusted due
to certain business factors and as such, the final  arrangement set forth in the
Purchase  Agreement  (as defined  herein)  includes  the grant of an  additional
option for 1,000,000 Shares pursuant to the Second Option Agreement as described
below. There was no additional consideration paid for this additional option and
such option was granted pursuant to the final terms of the original transaction.

          On July 17, 1998, M&M entered into a purchase agreement (the "Purchase
Agreement") with the Issuer, a copy of which is attached hereto as Exhibit B and
incorporated  by reference in response to this Item 6.  Pursuant to the terms of
the Purchase Agreement,  M&M purchased 3,305,500 Shares at $4.5375 per Share and
was granted Options to purchase 2,000,000 Shares at an exercise price of $4.5375
per Share.  The  description  of the terms of the  Purchase  Agreement  below is
qualified  in its  entirety  by  reference  to the  specific  provisions  of the
Purchase  Agreement.  The terms for the exercise of the Options are set forth in
the Option Agreements (as defined below).

          In  accordance  with  Section 4.2 of the  Purchase  Agreement,  M&M is
entitled to designate that percentage of the Issuer's Board of Directors that is
at  least  equal  to  M&M's  and its  affiliates'  percentage  ownership  of the
outstanding common stock of the Issuer.

          Pursuant to Section 5 of the Purchase  Agreement,  M&M shall not sell,
transfer,  pledge,  encumber or  otherwise  dispose of any of the Shares for one
year from July 17, 1998, the time of  acquisition  of the Shares,  other than to
affiliates, each of which shall be bound by the foregoing transfer restriction.

          On July  17,  1998,  M&M and the  Issuer  entered  into (i) a one year
option  agreement  (the "First  Option  Agreement")  a copy of which is attached
hereto as Exhibit C and (ii) a three year option  agreement  (the "Second Option
Agreement"), a copy of which is attached hereto as Exhibit D (collectively,  the

<PAGE>

                                                              Page 5 of 87 Pages

"Option Agreements"). Exhibits C and D are incorporated by reference in response
to this Item 6. Pursuant to these Option Agreements,  M&M is entitled to acquire
up to 1,000,000 Shares under each Option Agreement, subject to certain terms and
conditions.

          On July 17, 1998, the Issuer executed a Registration  Rights Agreement
for the benefit of M&M (the "Registration Rights Agreement"), a copy of which is
attached hereto as Exhibit E and incorporated herein by reference in response to
this  Item  6,  in  connection  with  the  acquisition  of  certain  Registrable
Securities  (as  defined  in the  Registration  Rights  Agreement),  which  term
includes the Shares and the Options to acquire Shares.  The Registration  Rights
Agreement  provides  that the Issuer  will use its best  efforts to qualify  for
registration  on Form S-3 or any successor form, and that holders of Registrable
Securities have certain  rights,  subject to  restrictions,  pertaining to their
ability to demand  that the Issuer  register  the  Restricted  Shares  under the
Securities Act.

          The Registration  Rights Agreement contains other provisions  relating
to registration procedures,  indemnification and contribution and other matters,
all of which are incorporated herein by reference.

          On July 17,  1998,  M&M  entered  into  and  executed  a  Shareholders
Agreement (the "Shareholders  Agreement") with Messrs.  Rafael Vaquero Bazan and
Fernando  Camacho  Casas  (collectively,  "the  Executives")  a copy of which is
attached  hereto as Exhibit F and  incorporated by reference in response to this
Item 6. Pursuant to Section 1 of the Shareholders Agreement, for a period of one
year from execution, M&M agrees not to sell, transfer, assign, exchange, pledge,
encumber or dispose of any Shares except to an Affiliate, each of which shall be
bound by the foregoing transfer restriction.

          Pursuant  to  Section  2 of the  Shareholders  Agreement,  M&M and the
Executives have agreed to provide a buy-sell  option to each other,  exercisable
at any time  after  one  year  from the date of  execution  subject  to  certain
conditions as provided in the Shareholders Agreement.

          From time to time, each of the Reporting  Person,  MSIF, Madera and/or
M&M  may  lend  portfolio  securities  to  brokers,  banks  or  other  financial
institutions.  These  loans  typically  obligate  the  borrower  to  return  the
securities,  or an equal amount of securities  of the same class,  to the lender
and  typically  provide that the borrower is entitled to exercise  voting rights
and to retain  dividends  during the term of the loan. From time to time, to the
extent permitted by applicable laws, each of the Reporting Person,  MSIF, Madera
and/or M&M may borrow  securities,  including  the  Shares,  for the  purpose of
effecting, and may effect, short sale transactions,  and may purchase securities
for the purpose of closing out short positions in such securities.

          Except as described above, the Reporting  Person,  MSIF, Madera and/or
M&M do not have any contracts,  arrangements,  understandings  or  relationships
with respect to any securities of the Issuer.

Item 7.  Material to be Filed as Exhibits.

     B.   Purchase Agreement executed July 17, 1998 between the Issuer and M&M.

     C.   First Option  Agreement  executed July 17, 1998 between the Issuer and
          M&M.

     D.   Second Option Agreement  executed July 17, 1998 between the Issuer and
          M&M.

<PAGE>

                                                              Page 6 of 87 Pages

     E.   Registration  Rights  Agreement  executed  July 17,  1998  between the
          Issuer and M&M.

     F.   Shareholders  Agreement  executed July 17, 1998 between the Issuer and
          M&M.

<PAGE>

                                                              Page 7 of 87 Pages

                                   SIGNATURES

     After  reasonable  inquiry and to the best of my knowledge and belief,  the
undersigned  certifies that the information set forth in this statement is true,
complete and correct.

Date: July 23, 1998

                            MEXICO STRATEGIC ADVISORS LLC



                            By:/s/ Miriam Rebling
                               ---------------------------
                               Miriam Rebling
                               Manager


<PAGE>
      
                                                              Page 8 of 87 Pages

<TABLE>
<CAPTION>


                                     ANNEX A

               Board of Advisors of Mexico Strategic Advisors LLC

Name/Citizenship               Principal Occupation               Business (or Residence) Address
<S>                            <C>                                <C>
Mr. Fernando Chico Pardo       Manager of Mexico Strategic        Bosque de Alisos, No. 47A, 3rd Floor
Mexico)                        Advisors LLC and Partner of        Colonia Bosques de las Lomas
                               Promecap, S.C.                     05120 Mexico, Distrito Federal


Mr. Jose Ignacio de            Associate of Promecap, S.C.        Bosque de Alisos, No. 47A, 3rd Floor
   Abeiga Pons                                                    Colonia Bosques de las Lomas
(Mexico)                                                          05120 Mexico, Distrito Federal

Mr. Juan Marco Gutierrez       Associate of Promecap, S.C.        Bosque de Alisos, No. 47A, 3rd Floor
   Wanless                                                        Colonia Bosques de las Lomas
(Mexico)                                                          05120 Mexico, Distrito Federal

Mr. Gary Gladstein             Managing Director of Soros         888 Seventh Avenue, 33rd Floor,
(United States)                Fund Management LLC                New York, New York 10106
 
Mr. Richard Katz               Private Investor                   Villa La Sirena, Vico dell'
(England)                                                         Olivetta 12, 18039 Mortola
                                                                  Inferiore, Ventimiglia, Italy
</TABLE>                                                         (Residence)


<PAGE>

                                                              Page 9 of 87 Pages


                                  EXHIBIT INDEX

B.   Purchase  Agreement  executed July 17, 1998 between The UniMark Group, Inc.
     and M&M Nominee LLC.

C.   First Option  Agreement  executed July 17, 1998 between The UniMark  Group,
     Inc. and M&M Nominee LLC.

D.   Second Option Agreement  executed July 17, 1998 between The UniMark Group,
     Inc. and M&M Nominee LLC.

E.   Registration  Rights  Agreement  executed July 17, 1998 between The UniMark
     Group, Inc. and M&M Nominee LLC.

F.   Shareholders  Agreement  executed July 17, 1998 between The UniMark  Group,
     Inc. and M&M Nominee LLC.



                                                             Page 10 of 87 Pages

                                    EXHIBIT B





                               PURCHASE AGREEMENT
                                 BY AND BETWEEN
                             THE UNIMARK GROUP, INC.
                                       AND
                              M & M NOMINEE L.L.C.
                            Dated as of July 17, 1998

<PAGE>

                                                             Page 11 of 87 Pages

1. ISSUANCE AND SALE OF PRIMARY SHARES........................................2

1.1. Definitions..............................................................2
1.2. Issuance, Purchase and Sale of the Shares................................2
1.3. Closing..................................................................2
1.4. Deliveries at Closing....................................................2

2. REPRESENTATIONS AND WARRANTIES OF THE COMPANY..............................3

2.1. Organization and Qualification...........................................3
2.2. Subsidiaries.............................................................4
2.3. Capitalization...........................................................4
2.4. Due Authorization........................................................5
2.5. Non-contravention; Consents and Approvals................................5
2.6. SEC Reports..............................................................6
2.7. Undisclosed Liabilities..................................................6
2.8. Taxes....................................................................7
2.9. Certain Changes..........................................................8
2.10. Litigation; Compliance with Laws........................................8
2.11. Title to Properties; Insurance..........................................8
2.12. ERISA...................................................................9
2.13. Possession of Franchises, Licenses, Etc.................................9
2.14. Environmental and Other Regulations....................................10
2.15. Patents and Trademarks.................................................10
2.16. Material Contracts and Obligations.....................................11
2.17. Brokers................................................................12
2.18. Accuracy of Information................................................12
2.19. Offering of Primary Shares.............................................12
2.20. Costs of "Year 2000" Modifications.....................................12

3. REPRESENTATIONS AND WARRANTIES OF EACH PURCHASER..........................12


3.1. Organization and Qualification..........................................12
3.2. Due Authorization.......................................................12
3.3. Acquisition for Investment..............................................13
3.4. Brokers.................................................................13
3.5. Non-contravention; Consents and Approvals...............................13
3.6. Accredited Investor.....................................................13


   
                                       -i-

<PAGE>

                                                             Page 12 of 87 Pages

4. COVENANTS OF THE COMPANY..................................................14

4.1. Negative Covenants......................................................14
4.2. Board Representation....................................................16
4.3. Compliance with Laws....................................................17
4.4. Insurance...............................................................17
4.5. Preservation of Existence, Franchises...................................17
4.6. Payment of Taxes and Other Charges......................................17
4.7. Reports; Access.........................................................17
4.8. Dividends...............................................................18
4.9. Limitation on Agreements................................................18
4.10. Merger.................................................................19
4.11. Notice of Breach.......................................................19
4.12. Real Property Holding Company..........................................19

5. RESTRICTIONS ON TRANSFER..................................................19

6. INDEMNIFICATION...........................................................19

6.1. Survival................................................................19
6.2. Indemnification.........................................................20
6.3  Procedures for Claims...................................................21
6.4. Certain Provisions Regarding Indemnification............................22

7. INTERPRETATION............................................................23

7.1. Definitions.............................................................23
7.2. Index to Defined Terms..................................................26
7.3. Headings; Other Interpretation..........................................28

8. MISCELLANEOUS.............................................................28

8.1. Severability............................................................28
8.2. Specific Enforcement....................................................28
8.3. Entire Agreement........................................................28
8.4. Counterparts............................................................29
8.5. Notices and Other Communications........................................29
8.6. Amendments; Termination; Waivers........................................30
8.7. Cooperation.............................................................30
8.8. Successors and Assigns; Parties in Interest.............................30
8.9. Expenses................................................................31
8.10. Transfer of Shares.....................................................31
8.11. Governing Law; Consent to Jurisdiction.................................31
8.12. Publicity..............................................................32

                                      -ii-

<PAGE>
                                                             Page 13 of 87 Pages

          THIS PURCHASE AGREEMENT, dated as of July 17, 1998 (this "Agreement"),
by and between UNIMARK GROUP,  INC., a Texas corporation (the "Company") and M &
M Nominee L.L.C., a Delaware limited liability company ("Purchaser").

          WHEREAS,  the Company's  business consists primarily of (i) vertically
integrated  citrus  and  tropical  fruit  growing,  processing,   marketing  and
distribution   operations  and  related   activities   (the  "Fruit   Processing
Operations"), and (ii) the production of citrus concentrate, oils and juices and
related activities (the "Juice and Oils Operations");

          WHEREAS,  the  Company is  authorized  to issue  20,000,000  shares of
common stock, par value $0.01 per share, of the Company (the "Common Stock");

          WHEREAS,  Purchaser  desires to  purchase  from the  Company,  and the
Company  desires to issue to Purchaser,  3,305,500 newly issued shares of Common
Stock (the "Primary  Shares") for a purchase price of U.S.$4.5375  per share, or
an aggregate purchase price of U.S.$14,998,706.25 in cash;

          WHEREAS,  in  furtherance  of such  desires,  the  Company  and Mexico
Strategic Investment Fund, Ltd. entered into a letter agreement,  dated June 22,
1998  (the  "Letter  Agreement")  providing  for the  transactions  contemplated
hereby;

          WHEREAS,  to induce  Purchaser  to purchase  the Primary  Shares,  the
Company is  contemporaneously  herewith,  and  conditioned  hereon,  granting to
Purchaser (i) an option pursuant to which Purchaser shall have the right,  for a
period of one year from the date hereof,  to acquire up to  1,000,000  shares of
Common Stock (the "First  Option") on terms  specified in the First Stock Option
Agreement,  dated as of the date hereof,  between the Company and Purchaser (the
"First Option Agreement"), (ii) an option pursuant to which Purchaser shall have
the right,  for a period of three years from the date  hereof,  to acquire up to
1,000,000  shares of Common Stock (the "Second  Option" and,  together  with the
First  Option,  the  "Options")  on terms  specified  in the Second Stock Option
Agreement,  dated as of the date hereof,  between the Company and Purchaser (the
"Second Option  Agreement" and,  together with the First Option  Agreement,  the
"Option  Agreements"),   and  (iii)  registration  rights  as  set  forth  in  a
Registration Rights Agreement,  dated as of the date hereof, between the Company
and Purchaser (the "Registration Rights Agreement");

<PAGE>
                                                             Page 14 of 87 Pages

          WHEREAS, in connection herewith,  and conditioned hereon, the Board of
Directors  of the Company  has amended the bylaws of the Company to  incorporate
therein the provisions of Sections 4.1, 4.8 and 4.10; and

          WHEREAS,  contemporaneously  herewith,  certain  shareholders  of  the
Company are  entering  into  agreements  with  Purchaser  to provide for certain
rights and  obligations in connection  with the purchase and sale of the Primary
Shares and with respect to  restrictions  on sale by such  shareholders of their
shares of Common Stock.


1.        Issuance and Sale of Primary Shares.

          1.1. Definitions. Certain capitalized terms used in this Agreement are
defined in Article 7. An index of defined terms is set forth in Section 7.2.

          1.2.  Issuance,  Purchase  and Sale of the Shares.  Upon the terms set
forth herein and subject to the contemporaneous  deliveries set forth in Section
1.4,  the  Company is issuing to  Purchaser,  and  Purchaser  is buying from the
Company, the Primary Shares for a purchase price (the "Purchase Price") equal to
U.S.$14,998,706.25.

          1.3. Closing. The closing of the transactions contemplated hereby (the
"Closing")  is taking place at the offices of Fried,  Frank,  Harris,  Shriver &
Jacobson, New York, New York, contemporaneously herewith.

          1.4.  Deliveries  at  Closing.  (a)  Contemporaneously  herewith,  the
Company is delivering the following:

                    (i) a certificate or certificates  representing  the Primary
               Shares;

                    (ii) the First Option Agreement, executed by the Company;

                    (iii) the Second Option Agreement, executed by the Company;

                    (iv) the  Registration  Rights  Agreement,  executed  by the
               Company;

                                      -2-

<PAGE>
                                                             Page 15 of 87 Pages

                    (v) a certificate, dated as of the date hereof, of the chief
               executive  officer  or chief  financial  officer  of the  Company
               certifying  that (x) the  representations  and warranties made by
               the  Company  herein  are  true  and  correct,  and (y)  that the
               conditions  set forth in clauses (i) through (iv) of Paragraph 12
               of the Letter Agreement are true;

                    (vi) a  certificate,  dated  as of the date  hereof,  of the
               secretary or other appropriate  officer of the Company certifying
               the names of the officer or officers of the Company authorized to
               sign this Agreement and any other documents  provided for in this
               Agreement,  together with a sample of the true  signature of each
               such officer,  and certifying as to the truth and completeness of
               the following  attachments to such  certificate:  (x) a certified
               copy of the Company's  current articles of incorporation  and any
               amendments  thereto,  (y) a copy of the Company's  current bylaws
               and any amendments  thereto,  and (z) resolutions of the Board of
               Directors of the Company  authorizing  the execution and delivery
               of this Agreement and any other documents provided for herein and
               the performance hereof and thereof; and

                    (vii) the opinion, dated as of the date hereof, of Jordaan &
               Pennington,  counsel  to the  Company,  in the form set  forth in
               Exhibit A hereto.

(b)      Contemporaneously herewith, Purchaser is delivering the following:

                    (i) the Purchase Price, payable in cash, in U.S. dollars, by
               wire transfer of immediately available funds;

                    (ii) a  certificate,  dated  as of the date  hereof,  of the
               chief executive  officer or chief financial  officer of Purchaser
               certifying  that  the  representations  and  warranties  made  by
               Purchaser herein are true and correct; and

                    (iii) a  certificate,  dated as of the date  hereof,  of the
               secretary or other  appropriate  officer of Purchaser  certifying
               the names of the officer or officers of Purchaser  authorized  to
               sign this Agreement and any other documents  provided for in this
               Agreement,  together with a sample of the true  signature of each
               such officer,  and certifying as to the truth and completeness of
               following  attachments to such certificate:  (x) a certified copy
               of   Purchaser's   current   certificate  of  formation  and  any
               amendments thereto,  (y) a copy of Purchaser's current bylaws (or
               equivalent   document)  and  any  amendments  thereto,   and  (z)
               resolutions  of the  governing  or  managing  board of  Purchaser
               authorizing  the execution and delivery of this Agreement and any
               other documents  provided for herein and the  performance  hereof
               and thereof.

                                      -3-

<PAGE>

                                                             Page 16 of 87 Pages

(iii) 2.  Representations and Warranties of the Company(iii).

          The Company represents and warrants as of the date hereof as follows:

          2.1.  Organization  and  Qualification.  Each of the  Company  and its
Subsidiaries is a corporation duly organized and existing in good standing under
the laws of the  jurisdiction in which it is  incorporated  and has the power to
own its respective property and to carry on its respective business as now being
conducted.  Each of the  Company and its  Subsidiaries  is duly  qualified  as a
foreign corporation to do business and in good standing in every jurisdiction in
which the nature of the  respective  business  conducted or property owned by it
makes such qualification  necessary except where the failure so to qualify would
not, individually or in the aggregate, have or reasonably be expected to have a
Material Adverse Effect.

          2.2. Subsidiaries. Schedule 2.2 sets forth a list of the Subsidiaries.
Except  as set  forth  in  Schedule  2.2,  the  Company  is not  subject  to any
obligation or  requirement  to provide funds to or make any  investment  (in the
form of a loan,  capital  contribution or otherwise) in any entity or enterprise
that is not wholly owned by a  Subsidiary.  Except as set forth in Schedule 2.2,
the  Company  owns  directly or  indirectly  each of the  outstanding  shares of
capital  stock (or other  ownership  interests  having by their  terms  ordinary
voting  power to elect a majority  of  directors  or others  performing  similar
functions with respect to such subsidiary) of each Subsidiary, free and clear of
all liens, pledges,  security interests,  claims or other encumbrances.  Each of
the outstanding  shares of capital stock of each Subsidiary is duly  authorized,
validly issued,  fully paid and nonassessable.  All of the capital stock of each
Subsidiary is owned by the Company and/or one or more wholly-owned  subsidiaries
of the Company.

          2.3.  Capitalization.  As of the date hereof,  the authorized  capital
stock of the Company consists of 20,000,000 shares of Common Stock, of which (i)
8,632,826 shares are validly issued and  outstanding,  (ii) no shares are issued
and held in treasury,  and (iii)  915,190  shares are reserved for issuance upon

                                      -4-

<PAGE>

                                                             Page 17 of 87 Pages

exercise of existing  Company  Options (as defined  below).  No shares of Common
Stock are held by any Subsidiary. Each outstanding share of Common Stock is duly
authorized,  validly  issued,  fully  paid and  nonassessable,  and has not been
issued in violation of any preemptive or similar rights. Other than as set forth
in Schedule 2.3 and as contemplated by the Option  Agreements:  (i) there are no
outstanding   subscriptions,   options,   warrants,   puts,  calls,  agreements,
understandings,  claims  or  other  commitments  of  any  type  relating  to the
issuance,  sale,  repurchase  or transfer by the Company of any Common  Stock or
other  securities of the Company (the "Company  Options"),  or by the Company or
any Subsidiary of any securities of a Subsidiary,  (ii) there are no outstanding
securities  which are convertible into or exchangeable for any shares of capital
stock or other  securities of the Company or any  Subsidiary,  and (iii) neither
the  Company  nor any  Subsidiary  has any  obligation  of any kind to issue any
additional  shares of capital stock or other securities to pay for or repurchase
any  shares  of  capital  stock or other  securities  of any  Subsidiary  or any
predecessor  thereof. The Primary Shares being delivered herewith have been duly
authorized,  validly issued,  fully paid and nonassessable,  are being delivered
free and clear of all claims,  liens,  encumbrances and security interests,  and
are eligible for NASDAQ NMS trading  without  further  consents or actions other
than registration with the Securities and Exchange Commission (the "Commission")
thereof  pursuant to the  Registration  Rights  Agreement.  The shares of Common
Stock which will be issued upon exercise of the Options have been authorized and
reserved for  issuance,  and when issued and  delivered in  accordance  with the
terms of the applicable Option Agreement, will be validly issued, fully paid and
nonassessable  and will be  eligible  for NASDAQ  NMS  trading  without  further
consents or actions other than registration thereof pursuant to the Registration
Rights Agreement.

          2.4. Due Authorization.  The execution and delivery of this Agreement,
the Option Agreements and the Registration Rights Agreement and the issuance and
sale of the Primary  Shares by the Company,  and  compliance by the Company with
all the provisions of the foregoing agreements  applicable to it: (i) are within
the  corporate  power  and  authority  of the  Company;  (ii) do not or will not
require any approval or consent of the  stockholders of the Company,  other than
approvals  and  consents  which  have been duly  obtained;  and (iii)  have been
authorized by all requisite  corporate  proceedings  on the part of the Company.
This Agreement, the Option Agreements and the Registration Rights Agreement have
been duly executed and delivered by the Company and constitute valid and binding
agreements  of the Company,  enforceable  in  accordance  with their  respective
terms.  The Company has  furnished to Purchaser  true and correct  copies of the
Company's Articles of Incorporation and bylaws as in effect on the date hereof.

          2.5.  Non-contravention;  Consents  and  Approvals.  None  of (i)  the
execution and delivery by the Company of this Agreement, the Registration Rights
Agreement and the Option Agreements, (ii) the issuance of the Primary Shares and
(iii) the fulfillment of and compliance with the terms and provisions hereof, of
the Registration Rights Agreement and of the Option Agreements applicable to the
Company, will:

               (a) conflict with, or result in a breach of any provision of, the
Articles of Incorporation or bylaws of the Company;

                                      -5-

<PAGE>

                                                             Page 18 of 87 Pages

               (b)  violate,  or  conflict  with,  or  result in a breach of any
provision  of, or  constitute a default (or an event  which,  with the giving of
notice, the passage of time or otherwise,  would constitute a default) under, or
entitle any party (with the giving of notice,  the passage of time or otherwise)
to  terminate,  accelerate,  modify  or call a default  under,  or result in the
creation of any lien,  security interest,  charge or encumbrance upon any of the
properties  or assets of the  Company  under,  any of the terms,  conditions  or
provisions  of any note,  bond,  mortgage,  indenture,  deed of trust,  license,
contract,  undertaking,  agreement,  lease or other  instrument or obligation to
which the Company or any Subsidiary is a party;

               (c) violate any Law  applicable to the Company or any  Subsidiary
or any of their respective properties or assets; or

               (d) require  any action or consent or approval  of, or review by,
or  registration  or filing by the Company or any of its  Affiliates  with,  any
third party (including, without limitation, securities authority or exchange) or
any  local,  domestic,   foreign  or  multinational  court,  arbitral  tribunal,
administrative  agency or commission or other  governmental or regulatory  body,
agency,  instrumentality or authority (a "Governmental  Authority"),  other than
registrations  or other actions required under federal and state securities laws
as are contemplated by the Registration Rights Agreement;

except in the case of (b), (c) and (d), for any of the foregoing that would not,
individually  or in the  aggregate,  have or  reasonably  be  expected to have a
Material Adverse Effect.

          2.6. SEC Reports. The Company has timely filed with the Commission all
forms, reports,  schedules,  statements and other documents required to be filed
by it (other  than the  Company's  proxy  statement  in  respect  of its  annual
shareholders  meeting  to be held in 1998)  since  January  1,  1996  under  the
Exchange Act or the Securities Act (such documents,  as supplemented and amended
since the time of filing, collectively, the "SEC Documents"). The SEC Documents,
including any financial  statements or schedules  included therein,  at the time

                                      -6-

<PAGE>
                                                             Page 19 of 87 Pages

filed (and, in the case of registration statements and proxy statements,  on the
dates of  effectiveness  and the  dates of  mailing,  respectively)  (a) did not
contain any untrue statement of a material fact or omit to state a material fact
required  to be stated  therein  or  necessary  in order to make the  statements
therein,  in  light  of the  circumstances  under  which  they  were  made,  not
misleading,  and (b)  complied  in all  material  respects  with the  applicable
requirements of the Exchange Act and the Securities Act, as the case may be. The
financial  statements  of the Company  included in the SEC Documents at the time
filed (and, in the case of registration statements and proxy statements,  on the
dates of effectiveness  and the dates of mailing,  respectively)  complied as to
form in all material respects with applicable  accounting  requirements and with
the published rules and regulations of the Commission with respect thereto, were
prepared  in  accordance  with U.S.  generally  accepted  accounting  principles
applied on a  consistent  basis  during the periods  involved  (except as may be
indicated  in the notes  thereto  or, in the case of  unaudited  statements,  as
permitted by Form 10-Q of the Commission),  and fairly present (subject,  in the
case  of the  unaudited  interim  financial  statements,  to  normal,  recurring
year-end  audit  adjustments  consistent  with past  practice),  in all material
respects,   the  consolidated   financial   position  of  the  Company  and  the
Subsidiaries  as at the dates  thereof  and the  consolidated  results  of their
operations  and cash flows for the periods then ended.  No Subsidiary is subject
to the periodic  reporting  requirements of the Exchange Act or required to file
any form,  report or other document with the  Commission,  any stock exchange or
any other comparable Governmental Authority (domestic or foreign).

          2.7. Undisclosed Liabilities. The Company and its Subsidiaries have no
liabilities,  contingent  or otherwise,  not reflected in the Company's  balance
sheet as of March 31,  1998 included in the SEC Documents or otherwise  referred
to in the SEC  Documents,  or otherwise  disclosed  to the  Purchaser in writing
prior to the date  hereof,  other  than any  such  liabilities  incurred  in the
ordinary  course of business  since  March 31,  1998 or  incurred in  connection
herewith.

          2.8.  Taxes.  Except as set forth in Schedule  2.8 and except for such
matters that would not, individually or in the aggregate,  have or reasonably be
expected to have a Material Adverse Effect:

               (a) The Company and the  Subsidiaries  (i) have timely  filed all
Tax Returns (as defined in Section 2.8(c)) (including, but not limited to, those
filed on a consolidated,  combined or unitary basis) required to have been filed
by the Company or the Subsidiaries,  all of which Tax Returns are true,  correct
and  complete;  (ii) have within the time and manner  prescribed by Law paid all
Taxes (as  defined in  Section  2.8(c)),  required  to be paid in respect of the
periods  covered  by such  Tax  Returns  or  otherwise  due to any  Governmental
Authority;  (iii) have  established and maintained on their  respective books an
records,  in accordance with their normal  accounting  practices and procedures,

                                      -7-

<PAGE>

                                                             Page 20 of 87 Pages

accruals and reserves that are adequate for the payment of all Taxes not yet due
and payable and attributable to any period  preceding the date hereof;  (iv) are
not  delinquent  in the payment of any Tax;  and (v) have not  received  written
notice of any deficiencies for any Tax from any Governmental  Authority  against
the Company or any Subsidiary,  which deficiency has not been satisfied. Neither
the Company nor any Subsidiary is the subject of any currently  ongoing audit or
judicial or  administrative  proceeding  relating to Taxes.  With respect to any
taxable  period ended prior to December 31, 1993, all federal income Tax Returns
including  the  Company or any  Subsidiary  have been  audited  by the  Internal
Revenue Service or are closed by the applicable  statute of  limitations.  There
are no liens with respect to Taxes upon any of the properties or assets, real or
personal,  tangible or intangible,  of the Company or any Subsidiary (other than
liens  for Taxes not yet  due).  No claim  has ever  been made in  writing  by a
Governmental  Authority in a jurisdiction where the Company and the Subsidiaries
do not file Tax Returns that the Company or any  Subsidiary is or may be subject
to taxation by that  jurisdiction.  Neither the Company nor any  Subsidiary  has
filed an election under Section 341(f) of the Code to be treated as a consenting
corporation.

               (b) The Company and its  Subsidiaries  have withheld or collected
all Taxes required to have been withheld or collected in connection with amounts
paid or owing to any employee, independent contractor,  creditor, stockholder or
other third party and any such amounts required to be remitted to a Governmental
Authority  have been timely  remitted,  other than Taxes for  amounts  less than
$100,000 in the aggregate.

               (c)  For  purposes  of  this  Agreement,  (i)  "Tax"  (and,  with
correlative meaning, "Taxes") means any federal, state, local or foreign income,
gross receipts,  property,  sales, use, value added, license, excise, franchise,
capital,  net  worth,  estimated,  withholding,  employment,  payroll,  premium,
withholding,  alternative or added minimum, ad valorem, inventory, asset, gains,
transfer  or  excise  tax,  or  any  other  tax,  levy,  custom,  duty,  impost,
governmental  fee or other  like  assessment  or charge of any kind  whatsoever,
together  with  any  interest,  penalty  or  additions  to tax,  imposed  by any
Governmental  Authority,  and (ii)  "Tax  Return"  means any  return,  report or
similar  statement  required to be filed with respect to any Tax  (including any
attached  schedules),  including,  without  limitation,  any information return,
claim for refund, amended return or declaration of estimated Tax.

          2.9.  Certain  Changes.  Since  March  30,  1998 the  Company  and its
Subsidiaries  have operated  their  respective  businesses  only in the ordinary
course and no events have occurred which, individually or in the aggregate, have
or would  reasonably be expected to have a Material  Adverse Effect,  other than
changes disclosed or referred to in the SEC Documents or otherwise  disclosed to
the Purchaser in writing prior to the date of this Agreement.

                                      -8-

<PAGE>
                                                             Page 21 of 87 Pages


          2.10. Litigation; Compliance with Laws.

               (a)  There  is no  suit,  claim,  action,  proceeding,  audit  or
investigation  (each, an "Action")  pending or, to the knowledge of the Company,
threatened,  against  the  Company  or any of its  Subsidiaries  or any of their
respective  properties  or  assets,  which,  individually  or in  the  aggregate
(i) questions  the  validity  or  enforceability  of,  or  seeks  to  enjoin  or
invalidate  this  Agreement,  the Option  Agreements,  the  Registration  Rights
Agreement,  the Primary Shares or the Options or any action taken or to be taken
pursuant hereto or thereto,  or (ii) has or would reasonably be expected to have
a Material  Adverse  Effect  (other than as set forth in the SEC Documents or in
Schedule  2.10(a)).  Neither the Company  nor any  Subsidiary  is subject to any
outstanding  judgment,   order,  writ,   injunction,   decree  or  award  which,
individually or in the aggregate,  has or would reasonably be expected to have a
Material Adverse Effect.

               (b)  Except  as set  forth in the SEC  Documents  or in  Schedule
2.10(b),  and except for  environmental  matters  covered by Section  2.14,  the
Company has been and is in compliance with all applicable Laws.

               (c)  Neither the  Company  nor any  Subsidiary  is: (i) a "public
utility  company" or a "holding  company," or an  "affiliate"  or a  "subsidiary
company"  of a  "holding  company,"  or an  "affiliate"  of  such a  "subsidiary
company," as such terms are defined in the Public Utility Holding Company Act of
1935,  as amended,  or (ii) a "public  utility," as defined in the Federal Power
Act, as amended,  or (iii) an  "investment  company" or an  "affiliated  person"
thereof or an "affiliated person" of any such "affiliated person," as such terms
are defined in the Investment Company Act of 1940, as amended, or (iv) a "United
States real property holding corporation" as defined in section 897(c)(2) of the
Code.  Stock  ownership  in the Company is not a "United  States  real  property
interest" as defined in Code section 897(c)(1)(A)(ii).

          2.11.  Title to  Properties;  Insurance.  The  Company and each of its
Subsidiaries have good and valid title to, or, in the case of property leased by
any of them as lessee,  a valid and  subsisting  leasehold  interest  in,  their
respective  properties and assets, free of all liens and encumbrances other than
those  referred  to in the  financial  statements  of the  Company (or the notes
thereto) for the year ended  December 31, 1997,  included in the SEC  Documents,
except  in each  case for  such  defects  in title  and  such  other  liens  and
encumbrances which are disclosed in the SEC Documents or which would not have or
reasonably be expected to have a Material  Adverse  Effect.  The Company and its
Subsidiaries  maintain  insurance  in such  amounts,  including  self-insurance,
retainage and deductible arrangements,  and of such a character as is reasonable
for  companies  engaged in the same or similar  business.  Without  limiting the
generality of the  foregoing,  the Company  maintains  directors'  and officers'
insurance in amounts at least  comparable to public  companies of its size.  All
insurance policies of the Company and its Subsidiaries are disclosed in Schedule
2.11.

                                      -9-

<PAGE>
                                                             Page 22 of 87 Pages

          2.12.  ERISA.  No  accumulated   funding  deficiency  (as  defined  in
Section 302 of ERISA and Section 412 of the Code), whether or not waived, exists
with  respect to any Pension Plan (other than a  Multiemployer  Plan (as defined
below)).  No  liability  to the PBGC has been,  or is  reasonably  likely to be,
incurred with respect to any Pension Plan (other than a  Multiemployer  Plan) by
the Company,  any of its  Subsidiaries or any ERISA Affiliate (as defined below)
which is or would be materially adverse to the Company, its Subsidiaries and any
ERISA  Affiliate.  Neither the Company nor any of its Subsidiaries and any ERISA
Affiliate  has  incurred,  or is  reasonably  likely  to incur,  any  withdrawal
liability under Title IV of ERISA with respect to any  Multiemployer  Plan which
is or would be materially adverse to the Company, its Subsidiaries and its ERISA
Affiliates and if the Company,  its Subsidiaries and ERISA  Affiliates,  were to
completely  withdraw as of the date hereof from each Multiemployer Plan in which
they participate,  the Company,  its Subsidiaries and its ERISA Affiliates would
not incur any material withdrawal liability under Title IV of ERISA. Neither the
Company   nor  any  of  its   Subsidiaries   has  any   obligation   to  provide
post-retirement health benefits to any employee or former employee. No fiduciary
of any employee benefit plan (as defined in Section 3(3) of ERISA) maintained or
contributed  to by the  Company  or any  Subsidiary,  for the  benefit  of their
respective  employees  (each an  "Employee  Plan")  has  engaged  or caused  any
Employee  Plan to engage in any  transaction  prohibited  by Section 4975 of the
Code or Section 406 of ERISA which is  reasonably  likely to subject the Company
or any Subsidiary, or any entity the Company or any Subsidiary has an obligation
to  indemnify,  to any tax or penalty  imposed under Section 4975 of the Code or
Section 502 of ERISA. Each Employee Plan has been maintained and administered in
compliance  with all applicable law including ERISA and the Code in all material
respects.  An "ERISA  Affiliate"  for  purposes of this  Section is any trade or
business,  whether or not  incorporated,  which,  together with the Company,  is
under common control, as described in Section 414(b) or (c) of the Code, and the
term "Multiemployer  Plan" shall mean any Pension Plan which is a "multiemployer
plan" (as such term is defined in Section 4001(a)(3) of ERISA).

          2.13.  Possession of  Franchises,  Licenses,  Etc. The Company and its
Subsidiaries possess all franchises,  certificates,  licenses, permits and other
authorizations  from  governmental  or  political   subdivisions  or  regulatory
authorities,  free  from  burdensome  restrictions,  that are  necessary  in any
material  respect to the Company or any of its  Subsidiaries  for the ownership,
maintenance and operation of their respective properties and assets, and neither
the Company nor any of its  Subsidiaries is in violation of any thereof,  except
as would not have or reasonably be expected to have a Material Adverse Effect.

                                      -10-

<PAGE>
                                                             Page 23 of 87 Pages

          2.14.   Environmental  and  Other  Regulations.   Except  for  matters
disclosed in Schedule  2.14 and except for matters that would not,  individually
or in the aggregate,  have or reasonably be expected to have a Material  Adverse
Effect,  (a) the  properties,  operations  and activities of the Company and the
Subsidiaries  have at all times been for all  applicable  periods of limitation,
and are, in compliance with all applicable  Environmental Laws and Environmental
Permits (each as defined below);  (b) the Company and the  Subsidiaries  and the
properties and operations of the Company and the Subsidiaries are not subject to
any  pending  or,  to the  Company's  knowledge,  threatened  Action  under  any
Environmental  Law,  including without limitation with respect to any present or
former operations, facilities or subsidiaries;  (c) there has been no release of
any Hazardous  Materials (as defined below) into the  environment by the Company
or any Subsidiary,  and there are no Hazardous  Materials present at, on, under,
within or which  have  migrated  from,  any  properties  of the  Company  or any
Subsidiary;  (d) there has been no  exposure  of any person or  property  to any
Hazardous Materials in connection with the properties, operations and activities
of the Company or any Subsidiary; and (e) neither the Company nor any Subsidiary
(x) has received any written  notice that the Company,  any Subsidiary or any of
their respective present or former operations,  facilities or subsidiaries is or
may be a potentially  responsible  party or otherwise  liable in connection with
any site used for the disposal of or otherwise  containing  Hazardous Materials,
or (y) has  disposed  of,  arranged  for the  disposal  of, or  transported  any
Hazardous  Materials  to any site  which  is  listed  on the U.S.  Environmental
Protection  Agency's  National  Priorities List or which is otherwise subject to
remediation  or  investigation.  The  Company  and the  Subsidiaries  have  made
available to Purchaser all material internal and external  environmental  audits
and reports (in each case  relevant to the Company or any  Subsidiary)  prepared
since January 1, 1993 and in the  possession  of the Company or any  Subsidiary.
The term  "Environmental  Laws" means all federal,  state, local or foreign laws
relating  to  pollution  or  protection  of  human  health  or  the  environment
(including,  without limitation,  ambient air, surface water, groundwater,  land
surface or subsurface strata),  including,  without limitation, laws relating to
emissions, discharges, releases or threatened releases of chemicals, pollutants,
contaminants,   or   industrial,   toxic  or  hazardous   substances  or  wastes
(collectively,   "Hazardous  Materials")  into  the  environment,  or  otherwise
relating to the manufacture,  processing, distribution, use, treatment, storage,
disposal,  transport  or  handling  of  Hazardous  Materials,  as  well  as  all
authorizations,   codes,  decrees,  demands  or  demand  letters,   injunctions,
judgments,  licenses,  notices  or notice  letters,  orders,  permits,  plans or
regulations issued, entered, promulgated or approved thereunder, as in effect on
the  date   hereof.   "Environmental   Permit"   means  any  permit,   approval,
identification  number,  license or other authorization required under or issued
pursuant to any applicable Environmental Law.

          2.15. Patents and Trademarks. Set forth in Schedule 2.15 is a true and
complete list of all patents,  patent applications,  trademarks,  service marks,
trademark and service mark applications, trade names, copyrights and licenses of
any of  the  foregoing  presently  used  by the  Company  or any  Subsidiary  or
necessary for the conduct of the business of the Company and its Subsidiaries as
conducted and as proposed to be conducted (the "Intellectual  Property Rights").
The Company owns, or has the right to use under the agreements or upon the terms
described in Schedule  2.15, all of the  Intellectual  Property  Rights.  To the
Company's  knowledge,  the business conducted or proposed to be conducted by the
Company and its  Subsidiaries  does not  infringe or violate any of the patents,
trademarks,  service  marks,  trade  names,  copyrights,  licenses of any of the
foregoing,  trade  secrets or other  proprietary  rights of any other  person or
entity.  Except as set forth in Schedule  2.15, to the Company's  knowledge,  no
other  Person  has any right to or  interest  in any  inventions,  improvements,
discoveries  or other  confidential  information  utilized by the Company or any
Subsidiary in its business.

          2.16.  Material  Contracts  and  Obligations  Schedule  2.16 lists all
contracts,  agreements,  guarantees,  leases and executory  commitments  (each a
"Contract"),  other than any Contracts heretofore filed as an exhibit to any SEC
Document,  that  exist  as of the  date  hereof  to  which  the  Company  or any

                                      -11-
<PAGE>
                                                             Page 24 of 87 Pages


Subsidiary  is a party or by which it is bound and which fall  within any of the
following  categories:  (a) Contracts not entered into in the ordinary course of
business other than those that individually or in the aggregate are not material
to the  Company's  business,  (b)  joint  venture  and  partnership  agreements,
(c) Contracts  containing  covenants  purporting  to limit  the  freedom  of the
Company to compete in any line of business in any geographic area, (d) Contracts
relating to any  outstanding  commitment for capital  expenditures  in excess of
$500,000, (e) indentures,  mortgages, promissory notes, loan agreements or other
Indebtedness  in excess of $100,000 in the aggregate,  agreements or instruments
or commitments for the borrowing or the lending by the Company or any Subsidiary
of amounts in excess of $100,000 in the  aggregate or providing for the creation
of any charge, security interest,  encumbrance or lien upon any of the assets of
the Company and its Subsidiaries  with an aggregate value in excess of $100,000,
(f) stock purchase agreements, asset purchase agreements or other acquisition or
divestiture  agreements relating to material transactions since January 1, 1995,
(g) Contracts between the Company or any Subsidiary and any Affiliate, employee,
director,  officer or  Significant  Shareholder,  or (h) any agreement  which is
material to the  Company,  irrespective  of amount.  All  Contracts to which the
Company  or any  Subsidiary  is a party or by which it is bound  are  valid  and
binding  obligations  of the Company or the Subsidiary (as the case may be) and,
to the Company's knowledge, the valid and binding obligation of each other party
thereto  except  such  Contracts  which if not so valid and  binding  would not,
individually  or in the  aggregate,  have or  reasonably  be  expected to have a
Material  Adverse  Effect.  Neither the Company nor any  Subsidiary  nor, to the
Company's knowledge, any other party thereto is in violation of or in default in
respect of, nor has there occurred an event or condition  which with the passage
of time or giving of notice (or both) would constitute a default under or permit
the  termination  of, any such Contract except such violations or defaults under
or  terminations  which,  individually  or in the  aggregate,  would not have or
reasonably be expected to have a Material Adverse Effect.

          2.17. Brokers. Except as set forth in Schedule 2.17, no agent, broker,
investment  banker or other Person is or will be entitled to any broker's fee or
any other  commission  or  similar  fee from the  Company or any  Subsidiary  in
connection with any of the transactions contemplated by this Agreement.

          2.18.   Accuracy of Information.   None  of  the  representations  and
warranties  of the Company  contained  herein or the  information,  documents or
other materials (other than projections) which have been furnished in writing by
the Company or any of its  representatives  to the Purchaser in connection  with
the   transactions   contemplated  by  this  Agreement   contains  any  material

                                      -12-
<PAGE>

                                                             Page 25 of 87 Pages


misstatement of fact, or omits any material fact required to be stated herein or
therein or necessary to make the statements  herein and therein not  misleading.
All  projections  furnished  in writing by the  Company in  connection  with the
transactions contemplated by this Agreement (i) are bona fide projections of the
Company,  (ii) have  been  prepared by management of the Company after a careful
analysis of all material  data,  (iii) are based on  reasonable  assumptions  by
management of the Company and (iv)  represent the best estimate by management of
the Company,  based upon current  reasonable  assumptions,  as to the  financial
performance of the Company and the Subsidiaries for the periods  indicated,  but
do not represent any guarantee or assurance of the future  financial  results of
the Company and its Subsidiaries.

          2.19.  Offering of Primary Shares.  Neither the Company nor any Person
acting on its behalf has offered  any of the Primary  Shares to any Persons in a
manner that could  reasonably be expected to subject the  offering,  issuance or
sale of any of the Primary Shares to the registration  requirements of Section 5
of the Securities Act.

          2.20. Costs of "Year 2000"  Modifications.  The estimated costs to the
Company and its  Subsidiaries  of "Year 2000"  modifications  to their  computer
systems and software do not exceed $100,000.

3.   Representations and Warranties of each Purchaser.  Purchaser represents and
     warrants as of the date hereof as follows:

          3.1. Organization and Qualification.  Purchaser is a limited liability
company duly  organized and existing in good standing under the laws of Delaware
and has the power to own its respective  property and to carry on its respective
business  as now  being  conducted.  Purchaser  is duly  qualified  as a foreign
corporation to do business and in good standing in every  jurisdiction  in which
the nature of the  respective  business  conducted or property owned by it makes
such qualification  necessary,  except where the failure to so qualify would not
prevent consummation of the transactions  contemplated hereby or have a material
adverse effect on Purchaser's ability to perform its obligations hereunder.

          3.2. Due Authorization.  The execution and delivery of this Agreement,
the Option Agreements and the Registration  Rights Agreement,  and compliance by
Purchaser with all the provisions of the foregoing agreements  applicable to it:
(i) are within the corporate  power and  authority of  Purchaser;  and (ii) have
been authorized by all requisite corporate proceedings on the part of Purchaser.
This Agreement, the Option Agreements and the Registration Rights Agreement have
been duly executed and delivered by Purchaser and constitutes  valid and binding
agreements of Purchaser, enforceable in accordance with their respective terms.

          3.3.  Acquisition for  Investment.  Purchaser is acquiring the Primary
Shares and the Options for its own account for the purpose of investment and not
with a view to or for sale in  connection  with any  distribution  thereof,  and
Purchaser has no present  intention or plan to effect any distribution  thereof.
Purchaser  acknowledges  that the Primary Shares and the Options (and the shares
underlying  the Options) have not been  registered  under the Securities Act and
may be sold or disposed of in the absence of such  registration only pursuant to
an exemption from such registration.

                                      -13-

<PAGE>

                                                             Page 26 of 87 Pages


          3.4. Brokers. No agent,  broker,  investment banker or other Person is
or will be entitled to any broker's fee or any other  commission  or similar fee
from Purchaser in connection with any of the  transactions  contemplated by this
Agreement.

          3.5.  Non-contravention;  Consents  and  Approvals.  None  of (i)  the
execution and delivery by Purchaser of this Agreement,  the Registration  Rights
Agreement and the Option Agreements,  and (ii) the fulfillment of and compliance
by Purchaser with the terms and provisions  hereof,  of the Registration  Rights
Agreement and of the Option Agreements applicable to Purchaser, will:

               (a) conflict with, or result in a breach of any provision of, the
Certificate of Formation or other organizational documents of Purchaser; or

               (b)  violate,  or  conflict  with,  or  result in a breach of any
provision  of, or  constitute a default (or an event  which,  with the giving of
notice, the passage of time or otherwise,  would constitute a default) under, or
entitle any party (with the giving of notice,  the passage of time or otherwise)
to  terminate,  accelerate,  modify  or call a default  under,  or result in the
creation of any lien,  security interest,  charge or encumbrance upon any of the
properties  or  assets of  Purchaser  under,  any of the  terms,  conditions  or
provisions  of any note,  bond,  mortgage,  indenture,  deed of trust,  license,
contract,  undertaking,  agreement,  lease or other  instrument or obligation to
which  Purchaser  is a party,  except in the case of this clause (b), for any of
the  foregoing  that  would  not,  individually  or in the  aggregate,  have  or
reasonably be expected to have a material adverse effect on Purchaser's  ability
to perform its obligations hereunder.

          3.6. Accredited Investor. Purchaser is an "accredited investor" within
the meaning of Rule 501 of the Securities Act.

4.       Covenants of the Company.

          4.1. Negative Covenants. From the date hereof and as long as Purchaser
and its Affiliates  either (i)  Beneficially  Own 10% or more of the outstanding
Common Stock of the Company,  or (ii) have not  transferred to Third Parties 50%
or more of the  Primary  Shares,  the  Company  shall not,  and shall  cause its
Subsidiaries  not to do any of the  following  things  without the prior written
consent of Purchaser:

                                      -14-

<PAGE>

                                                             Page 27 of 87 Pages


               (a) incur or,  from and  after the fifth day  following  the date
hereof,  maintain  any  Indebtedness  other  than (i) bank  lines of credit  for
working  capital  not in excess of U.S.$27  million  (in the  aggregate  for the
Company and its Subsidiaries),  (ii) Capital  Leases not in amounts in excess of
U.S.$2  million (in the  aggregate  for the Company and its  Subsidiaries),  and
(iii)  other  items of  Indebtedness  not in  excess  of  $1,000,000  (provided,
however,  that the  Company  shall  be  permitted  to  maintain  other  items of
Indebtedness  existing  on the date  hereof in amounts  not in excess of U.S.$16
million); and, at any time, allow the aggregate amount of the Indebtedness to be
greater than U.S.$42 million;

               (b) incur  liens or  encumbrances  other than liens to secure the
indebtedness permitted by Section 4.1(a) and other than Permitted Liens;

               (c) incur contingent  obligations or guaranties other than in the
ordinary course of business;

               (d)  enter  into a line  of  business  that  is  different  (in a
material respect) from the businesses  currently conducted by the Company or its
Subsidiaries  or conduct any material  business  activities  that are not either
currently  conducted  or directly  related to those  currently  conducted by the
Company or its Subsidiaries;

               (e) enter into any Contract or amend any existing Contract with a
value in excess of 5% of total assets (as set forth on the immediately preceding
year's  audited  financial  statements)  or enter any Contract or transaction or
amend any existing  Contract or  transaction  with any Affiliate or  Significant
Shareholder;

               (f) incur amounts for any capital  expenditure  in excess of 110%
of the amount  budgeted for such capital  expenditure on the budgets  previously
delivered to Purchaser, provided, however, that the Company may reallocate up to
20% of the  aggregate  amount of the capital  expenditure  budget per year among
capital  expenditure items listed in such budget or to other capital expenditure
items;

               (g) approve increases in any item in each year's annual budget in
excess of 5% over the amount budgeted for such item during the preceding year;

               (h) appoint or remove any executive officer of the Company;

               (i) amend the  Articles  of  Incorporation  or the  bylaws of the
Company  or any  Subsidiary,  or  adopt  any  rights  agreement,  plan or  other
instrument (e.g. a so-called "poison pill");

                                      -15-

<PAGE>

                                                             Page 28 of 87 Pages


               (j)  acquire  assets  (other  than  in  the  ordinary  course  of
business) or common stock, debt or other securities of any Third Party in excess
of $100,000 in the aggregate;

               (k) in any year,  sell or dispose of assets of the Company or any
Subsidiary  having a value in  excess  of 10% of the  value of the  total  fixed
assets  of the  Company  and its  Subsidiaries  (as set  forth in the  Company's
consolidated  audited  balance  sheet at the end of the prior fiscal year) other
than the proposed sale of the Company's Hidalgo warehouse facility;

               (l) in any year, sell or dispose of assets of any facility of the
Company  having a value in excess of 5% of the  value of such  facility's  total
fixed assets (as set forth in the Company's  consolidated  audited balance sheet
at the end of the prior fiscal year);

               (m) make or maintain any investment in or capital contribution or
advance  to  any  other  Person,   other  than   investments   in   wholly-owned
subsidiaries;  or  enter  into  joint  ventures  or  partnerships  or  establish
non-wholly  owned   subsidiaries,   except,   in  each  case,  for  investments,
contributions or arrangements described in Schedule 4.1;

               (n)  in  any  transaction  or  series  of  transactions,  acquire
(including pursuant to a merger or consolidation) all or any substantial portion
of the business or assets of any Person,  except for  transactions not in excess
(in the aggregate) of $100,000;

               (o) dissolve or liquidate the Company;

               (p)  issue  any  securities  of the  Company  or  any  Subsidiary
(including,  without limitation,  common stock, convertible securities,  rights,
warrants  or  options  to  one or  more  Persons  (including  through  a  public
offering)),  other than pursuant to an employee  benefit plan or director  stock
option plan consistent with past practice and other than the exercise of Company
Options;

               (q) register  Common Stock or other  securities of the Company or
any  Subsidiary  under the  Securities  Act (except as provided in  registration
rights  agreements  existing on the date hereof and  disclosed  to  Purchaser or
subsequently  entered  into with the  consent  of  Purchaser  or  pursuant  to a
registration  statement on Form S-8 in connection with the employee stock option
plan or the director stock option plan) or grant any registration rights;

               (r) effect any debt or equity  repurchase  or redemption or other
restricted  payment,  other  than  payment  of debt in the  ordinary  course  of
business;

                                      -16-

<PAGE>
                                                             Page 29 of 87 Pages


               (s)   change   the   Company's   independent   certified   public
accountants;

               (t) adopt or amend, in any material respect, any employee benefit
plan; and

               (u) settle any material Action.


          4.2. Board Representation.

               (a) Within 10 days of the date hereof, the Company shall take all
necessary  action to cause the  Purchaser  Designees  (as  defined  below) to be
elected to the Board of Directors of the Company.  In  connection  with the 1998
Annual Meeting of  Shareholders,  the Company shall take all necessary action to
cause the Purchaser  Designees to be nominated and shall use its best efforts to
cause such  Purchaser  Designees  to be elected to the Board of Directors of the
Company.  Thereafter,  in connection  with any annual meeting of shareholders at
which the term of a Purchaser  Designee is to expire,  the Company will take all
necessary action to cause a Purchaser  Designee to be nominated and use its best
efforts to cause such Purchaser Designee to be elected to the Board of Directors
of  the  Company.  In  the  event  of  any  vacancy  arising  by  reason  of the
resignation,  death,  removal,  or  inability  to serve of any of the  Purchaser
Designees,  Purchaser  shall be entitled to  designate a successor  to fill such
vacancy for the unexpired  term. If any Purchaser  Designee is not elected at an
annual  meeting of  shareholders,  Purchaser  shall be entitled to  designate an
alternative  Person and the Company shall,  within 10 days of such  designation,
take all necessary action to cause such alternative  Person to be elected to the
Board of  Directors  of the  Company.  "Purchaser  Designees"  shall  mean those
individuals  designated from time to time by Purchaser to serve on the Company's
Board of  Directors.  The number of  Purchaser  Designees  shall be the smallest
number  possible  such that the ratio of Purchaser  Designees to total number of
directors  (after  election of the  Purchaser  Designees) is at any time greater
than or equal to the ratio of the number of Primary Shares held by Purchaser and
its  Affiliates to total number of shares of Common Stock  outstanding  (e.g. if
there are 7 directors  without the  Purchaser  Designees  and  Purchaser and its
Affiliates own 27% of the Common Stock outstanding, then the number of Purchaser
Designees will be three, resulting in a total of 10 directors).

               (b) The Company shall maintain directors' and officers' insurance
in at least the amount  currently  maintained by the Company.  The Company shall
indemnify   Purchaser  and  the  current  and  former  Purchaser  Designees  (in
connection  with serving on the  Company's  Board of  Directors)  to the fullest
extent  permitted  by Law and,  upon  request,  the Company  shall enter into an
indemnification agreement with any such Purchaser Designee reasonably acceptable
to such  Purchaser  Designee.  The  Purchaser  Designees  shall be  entitled  to
reimbursement of expenses to the same extent that other non- employee  directors
of the Company are entitled to such reimbursement.

          4.3.  Compliance  with  Laws.  From  the  date  hereof  and as long as
Purchaser and its Affiliates  own any Primary  Shares,  the Company  shall,  and
shall cause the  Subsidiaries  to, comply with all  applicable  Laws,  including
without limitation,  financial and other reporting  requirements pursuant to the
Exchange Act.

                                      -17-

<PAGE>
                                                             Page 30 of 87 Pages

          4.4. Insurance.  From the date hereof and as long as Purchaser and its
Affiliates  own any  Primary  Shares,  the  Company  shall,  and shall cause the
Subsidiaries to, maintain insurance in such amounts,  including  self-insurance,
retainage and deductible arrangements,  and of such a character as is reasonable
for companies engaged in the same or similar business.

          4.5. Preservation of Existence,  Franchises.  From the date hereof and
as long as Purchaser  and its  Affiliates  own any Primary  Shares,  the Company
shall, and shall cause the Subsidiaries to, maintain their respective  corporate
existence, rights and franchises in full force and effect, provided that nothing
in  this   Section 4.5   shall  prevent  the  Company  or  any  Subsidiary  from
discontinuing  its  operations  in any  particular  state  or at any  particular
location or  locations  within the state,  or prevent the  corporate  existence,
rights and franchises of any Subsidiary from being terminated if, in the opinion
of the Board of Directors of the Company,  the preservation thereof is no longer
desirable  in the conduct of the  business  of the Company and its  Subsidiaries
taken as a whole.

          4.6.  Payment of Taxes and Other  Charges.  The  Company  shall pay or
discharge, and shall cause each of the Subsidiaries to pay or discharge,  before
the same become  delinquent,  (i) all Taxes,  assessments and other governmental
charges or levies imposed upon it or any of its properties or income (including,
without limitation, such as may arise under Section 4062, 4063, or 4064 of ERISA
or any similar provision of law), and (ii) all claims or demands of materialmen,
mechanics,  carriers,  warehousemen,  landlords and other like Persons which, in
the case of either  clause (i) or clause  (ii),  if unpaid,  might result in the
creation of a material lien upon any of its properties,  provided, however, that
the Company  shall not be required  to pay or  discharge  or cause to be paid or
discharged any such Tax, assessment, charge or claim whose amount, applicability
or validity is being contested in good faith pursuant to appropriate proceedings
and for which adequate  accruals and reserves for the payment  thereof have been
established  and  maintained  on the books and  records  of the  Company or such
Subsidiary.

          4.7.  Reports;  Access.  From the date hereof and as long as Purchaser
and its Affiliates  either (i)  Beneficially  Own 5% or more of the  outstanding
Common Stock of the Company,  or (ii) have not  transferred to Third Parties 75%
or more of the Primary Shares, the Company shall:

               (a) as soon as practicable  and in any event within 45 days after
the end of each quarterly period (other than the last quarterly  period) in each
fiscal year, furnish to Purchaser statements of consolidated net income and cash
flows and a statement  of changes in  consolidated  stockholders'  equity of the
Company  and its  Subsidiaries  for the period  from the  beginning  of the then
current  fiscal year to the end of such  quarterly  period,  and a  consolidated
balance  sheet  of the  Company  and  its  Subsidiaries  as of the  end of  such
quarterly period, setting forth in each case in comparative form figures for the
corresponding  period or date in the  preceding  fiscal year,  all in reasonable
detail and certified by an authorized financial officer of the Company,  subject
to changes resulting from year-end adjustments; provided, however, that delivery
pursuant to Section 4.7(c) of a copy of the Quarterly Report on Form 10-Q of the
Company for such quarterly  period filed with the Commission  shall be deemed to
satisfy the requirements of this clause;

                                      -18-

<PAGE>
                                                             Page 31 of 87 Pages


               (b) as soon as practicable  and in any event within 90 days after
the end of each fiscal year, furnish to Purchaser statements of consolidated net
income and cash flows and a statement of changes in  consolidated  stockholders'
equity of the Company and its  Subsidiaries  for such year,  and a  consolidated
balance  sheet of the Company and its  Subsidiaries  as of the end of such year,
setting forth in each case in comparative  form the  corresponding  figures from
the preceding fiscal year, all in reasonable detail and examined and reported on
by independent  public  accountants of recognized  national standing selected by
the Company;  provided,  however, that delivery pursuant to Section 4.7(c) below
of a copy of the Annual  Report on Form 10-K of the Company for such fiscal year
filed with the Commission  shall be deemed to satisfy the  requirements  of this
Section 4.7(b);

               (c)  promptly  upon  transmission  thereof,  furnish to Purchaser
copies of all  registration  statements  and all other  filings or  reports  the
Company files with the Commission; and

               (d) upon the good faith request by Purchaser for such information
from, or access to, the Company and its properties, books, records and personnel
as is  reasonable,  the  Company  shall  cooperate  in promptly  providing  such
information or access to Purchaser.

          4.8. Dividends.  From the date hereof and as long as Purchaser and its
Affiliates  either (i)  Beneficially  Own 5% or more of the  outstanding  Common
Stock of the Company,  or (ii) have not transferred to Third Parties 75% or more
of the Primary Shares,  the Company shall not, without the prior written consent
of  Purchaser,  effect  any  stock  repurchases,  pay  dividends  or make  other
distributions in respect of the Common Stock.

          4.9.  Limitation  on  Agreements.  From the date hereof and as long as
Purchaser and its Affiliates own any Primary  Shares,  the Company will not, and
will not permit any  Subsidiary  to, enter into any Contract,  or any amendment,
modification,   extension  or  supplement  to  any  existing   Contract,   which
contractually conflicts with any provision contained herein.

                                      -19-

<PAGE>
                                                             Page 32 of 87 Pages


          4.10.  Merger.  From the date hereof and as long as Purchaser  and its
Affiliates  either (i)  Beneficially  Own 10% or more of the outstanding  Common
Stock of the Company,  or (ii) have not transferred to Third Parties 50% or more
of the Primary Shares,  the Company shall not, and shall cause its  Subsidiaries
not to,  without the prior written  consent of Purchaser,  merge with or into or
consolidate  with any other  Person  (unless  the Company is the  continuing  or
surviving  entity,  such transaction would not violate the provisions of Section
4.1, and immediately  after the  consummation of such  transaction the surviving
corporation  would not be in  violation  of the  provisions  of Section  4.1) or
otherwise effect a Change in Control.
 
          4.11. Notice of Breach.  As promptly as practicable,  and in any event
not later than ten days after senior  management of the Company becomes aware of
any breach by the Company of any provision of this Agreement, including, without
limitation,  this Article 4, the Company  shall provide  Purchaser  with written
notice specifying the nature of such breach and any actions proposed to be taken
by the Company to cure such breach.

          4.12. Real Property Holding Company.

               (a)  From  the  date  hereof  and as  long as  Purchaser  and its
Affiliates own any Primary Shares or shares of Common Stock acquired by exercise
of one or both of the  Options,  the Company  shall not become a "United  States
real property holding corporation" as defined in Code section 897(c)(2).

               (b) The  Company  shall,  at  Purchaser's  request,  (i)  provide
promptly  a letter  in the form set forth in  Exhibit B (with any  modifications
thereto as requested by Purchaser to comply with then existing  requirements  of
the Code and Treasury  Regulations  thereunder),  and comply  promptly  with the
notice requirements of Treasury Regulations section 1.897-2(h)(2) or (h)(4) (and
any  successors  thereto),  and  (ii) provide  the voluntary  notice to the U.S.
Internal   Revenue   Service   described   in   Treasury   Regulations   section
1.897-2(h)(4)(i).

5.   Restrictions on Transfer. Neither Purchaser nor any of its Affiliates will,
     directly or  indirectly,  sell,  transfer,  pledge,  encumber or  otherwise
     dispose of  (collectively,  a "Transfer") any of the Primary Shares for one
     year from the date hereof,  except for  Transfers to or between  Affiliates
     who  agree  to be  bound  by the  provisions  of  this  Agreement.  Neither
     Purchaser  nor any of its  Affiliates  will at any time Transfer any of the
     Primary Shares in violation of the  Securities Act or any applicable  state
     securities laws.

6.   Indemnification.

          6.1.  Survival.  The  representations  and  warranties  made  in  this
Agreement or in documents  delivered in  connection  herewith  shall survive the
Closing for  18 months  from the date hereof  (such 18- month  period  being the
"Indemnification  Period")  and on the 18 month  anniversary  of the date hereof
shall expire,  together  with any right to  indemnification  for breach  thereof

                                      -20-

<PAGE>

                                                             Page 33 of 87 Pages


except to the extent a Valid  Third  Party  Claim  Notice (as defined in Section
6.3(a)) or Valid Other  Claim  Notice (as defined in Section  6.3(b))  (each,  a
"Valid Claim Notice") shall have been given with respect to such  representation
or warranty prior to the expiration of the applicable  Indemnification Period in
accordance  with  Section  6.3  by  the  party  seeking   indemnification   (the
"Indemnitee")  to the party  from which  indemnification  is being  sought  (the
"Indemnitor"), in which case the representation or warranty alleged in the Valid
Claim Notice to have been breached shall survive, to the extent of the claim set
forth  in  the  Valid  Claim  Notice   only,   until  such  claim  is  resolved.
Notwithstanding  the preceding  sentence,  the  representations  and  warranties
contained in Section 2.3 shall not expire and the corresponding  Indemnification
Period shall be perpetual,  without  expiration.  The  covenants and  agreements
contained  herein  (other than the covenant and  agreement to indemnify  against
breaches of representations  and warranties,  which shall expire as set forth in
the first and second  sentences of this  Section 6.1) shall  survive the Closing
until the covenants and  agreements  are complied with in accordance  with their
terms.
 
          6.2. Indemnification. (a) Subject to the provisions of this Article 6,
the  Company  shall  defend  and  indemnify  Purchaser,  its  Affiliates,  their
directors  and  officers  and the  Purchaser  Designees  and  hold  each of them
harmless from and against all damages, claims, losses, Taxes, charges,  actions,
suits,  proceedings,  deficiencies,  interest,  penalties,  fines,  liabilities,
obligations,   amounts  paid  in  settlements,  costs  and  expenses  (including
reasonable  attorneys'  fees)  (collectively,  "Losses")  which  are  sustained,
incurred or  suffered  by any of them (i) by  reason of the breach of any of the
representations  or  warranties  made by the Company  herein or in any  document
delivered in  connection  herewith,  (ii) by  reason of the breach of any of the
Company's covenants and agreements contained herein or in any document delivered
in  connection  herewith,  or (iii) for  Losses in  connection  with any  Action
arising out of the transactions  contemplated hereby (other than Actions arising
out of a breach by  Purchaser  or its  Affiliates  of the this  Agreement or the
documents delivered in connection herewith);  provided, however, that Purchaser,
its Affiliates,  their  directors and officer and the Purchaser  Designees shall
not be entitled to any recovery  unless a claim for  indemnification  is made in
accordance  with  Section 6.3,  so as to  constitute a Valid Claim  Notice,  and
within the time period of survival set forth in Section 6.1.
 
               (b) Subject to the provisions of this Article 6, Purchaser  shall
defend  and  indemnify  the  Company  and its  Affiliates  and hold each of them
harmless  from and against all Losses  which are  incurred or suffered by any of
them (i) by reason of the breach by Purchaser of any of the  representations  or
warranties  made  by it  herein  or in  any  document  delivered  in  connection
herewith, or (ii) by reason of the breach of any of its covenants and agreements
contained herein or in any document delivered in connection herewith;  provided,
however,  that the  Company  and its  Affiliates  shall not be  entitled  to any
recovery  unless  a  claim  for  indemnification  is  made  in  accordance  with
Section 6.3,  so as to  constitute  a Valid  Claim  Notice,  and within the time
period of survival set forth in Section 6.1.
 
          6.3  Procedures  for Claims.  (a) (i) In order for an Indemnitee to be
entitled to any remedy  provided for under this Article 6 in respect of, arising
out of or involving a claim made by any Third Party against the Indemnitee or an
Affiliate (a "Third Party Claim"),  the Indemnitee must notify the Indemnitor in
writing  of the  Third  Party  Claim (a "Third  Party  Claim  Notice")  promptly
following  receipt by such  Indemnitee  of  written or oral  notice of the Third

                                      -21-

<PAGE>

                                                             Page 34 of 87 Pages


Party  Claim,  which  notification,  to be a valid Third  Party Claim  Notice (a
"Valid Third Party Claim Notice"),  must be accompanied by a copy of the written
notice,  if any, of the Third Party  claimant to the  Indemnitee  asserting  the
Third  Party  Claim,  or, if such Third  Party Claim shall not have been made in
writing,  the  written  notice of  Indemnitee  certifying  as to the  receipt by
Indemnitee  of the oral Third Party Claim,  and, in each case,  setting forth in
reasonable detail, the facts then known by Indemnitee with respect to such Third
Party Claim; provided, however, that the failure to provide such Notice promptly
(so long as a Valid Third Party Claim Notice is given before the  expiration  of
the Indemnification  Period and any extensions thereof, as applicable) shall not
affect the  obligations  of the  Indemnitor  hereunder  except to the extent the
Indemnitor is actually prejudiced  thereby.  The Indemnitee shall deliver to the
Indemnitor  copies of all other notices and documents  (including  court papers)
received by the Indemnitee relating to the Third Party Claim.
 
               (ii) The  Indemnitor  shall have the right to defend  against any
such Third Party Claim  (including the conduct of any  proceedings or settlement
negotiations,  provided  that the  Indemnitor  shall not settle any Third  Party
Claim without the Indemnitee's consent,  which consent shall not be unreasonably
withheld  or  delayed)  with  counsel  of the  Indemnitor's  own  choosing.  The
Indemnitee shall have the right to participate in the defense of any Third Party
Claim and to employ its own counsel  (it being  understood  that the  Indemnitor
shall control such defense), at the Indemnitee's own expense.  Prior to the time
the Indemnitee is notified by the  Indemnitor as to whether the Indemnitor  will
assume the defense of a Third Party Claim, the Indemnitee shall take all actions
reasonably  necessary to timely  preserve the  collective  rights of the parties
with respect to such Third Party  Claim,  including  responding  timely to legal
process.  If the Indemnitor shall decline to assume the defense of a Third Party
Claim (or shall fail to notify the  Indemnitee  of its  election  to defend such
Third  Party  Claim)  within 30 days after the giving by the  Indemnitee  to the
Indemnitor  of a Valid Third Party Claim  Notice with respect to the Third Party
Claim,  the  Indemnitee  shall  defend  against  the Third  Party  Claim and the
Indemnitor  shall  be  liable  to the  Indemnitee  for all  reasonable  fees and
expenses  incurred by the  Indemnitee  in the defense of the Third Party  Claim,
including  the  reasonable  fees  and  expenses  of  counsel   employed  by  the
Indemnitee, if and to the extent that the Indemnitor is responsible to indemnify
for such Third Party Claim.  Regardless  of which party assumes the defense of a
Third Party Claim, the parties agree to cooperate with one another in connection
therewith.  Such  cooperation  shall include  providing  records and information
which are relevant to such Third Party Claim,  and which are not required by law
to be kept  confidential  and  making  employees  and  officers  available  on a
mutually  convenient basis to provide additional  information and explanation of
any  material  provided  hereunder  and to act as a witness  or respond to legal
process.  Whether or not the  Indemnitor  assumes  the  defense of a Third Party
Claim,  the Indemnitee shall not admit any liability with respect to, or settle,
compromise or discharge,  such Third Party Claim without the Indemnitor's  prior
written consent (which consent will not be unreasonably withheld or delayed).
 
               (b)  In  order  for  an   Indemnitee   to  be   entitled  to  any
indemnification  provided  for under this  Article 6 in respect of a claim as to
which a Third Party Claim has not been  asserted  against  such  Indemnitee  (an
"Other Claim"), the Indemnitee must promptly notify the Indemnitor in writing of

                                      -22-

<PAGE>
                                                             Page 35 of 87 Pages

such Other Claim (the "Other Claim Notice"),  which notification,  to be a valid
Other  Claim  Notice (a "Valid  Other  Claim  Notice"),  must  certify  that the
Indemnitee has in good faith already sustained some (though not necessarily all)
Losses,  or has a good faith  basis to believe  Losses  may be  sustained,  with
respect to such claim.  The failure by any  Indemnitee to notify the  Indemnitor
promptly (so long as a Valid Other Claim  Notice is given before the  expiration
of the  Indemnification  Period)  shall  not  relieve  the  Indemnitor  from any
liability that it may have to such  Indemnitee  under Section 6.2, except to the
extent that the Indemnitor has been actually prejudiced by such failure.
 
          6.4.   Certain   Provisions   Regarding   Indemnification.   (a)   The
indemnification  provided  in this  Article  6 shall be the  sole and  exclusive
remedy for any  inaccuracy or breach of any  representation  or warranty made by
the Company or Purchaser in this Agreement.
 
               (b)  Upon   making  any   payment  to  an   Indemnitee   for  any
indemnification  claim  pursuant  to this  Article  6, the  Indemnitor  shall be
subrogated,  to the extent of such payment,  to any rights which the  Indemnitee
may have against any other parties with respect to the subject matter underlying
such indemnification claim.
 
               (c)  The  amount  of any  Losses  shall  be  computed  net of any
insurance  proceeds  received by the  Indemnitee or its Affiliates in connection
therewith.
 
               (d) The amount of any indemnification payment made by the Company
to Purchaser  pursuant hereto shall be increased by dividing (x) the amount that
would be payable (but for this Section  6.4(d)),  by (y) one minus the Ownership
Fraction.  The "Ownership  Fraction"  means the number of Primary Shares held by
Purchaser and its  Affiliates at the time of such payment,  divided by the total
number of shares of Common Stock outstanding at the time of such payment.
 
               (e) For  purposes  of this  Article 6,  Promecap,  S.C.  shall be
deemed to be an Affiliate of Purchaser (irrespective of whether or not Promecap,
S.C.  is  from  time to  time  determined  to be an  Affiliate  pursuant  to the
definition of Affiliate contained in Section 7.1).
 
               (f)  Notwithstanding  any  provision  of  this  Article  6 to the
contrary,  (A) the  Company shall not be obliged to make any payments in respect
of indemnification  for a breach described in clause (i) of Section 6.2(a) until
the  aggregate  amount of payments that the Company is obliged to pay in respect
of  such  breaches  (without  reference  to this  Section  6.4(f))  is at  least
$250,000,  at which  point all  payments  that the  Company is obliged to pay in
respect of such  breaches  shall be payable,  and (B) the  Company  shall not be
obliged to make any  payments  in respect of  indemnification  for  breaches  of
representations  and  warranties  described  in clause (i) of Section  6.2(a) in
excess of $16,500,000.

                                      -23-

<PAGE>

                                                             Page 36 of 87 Pages

 
7.   Interpretation.

          7.1. Definitions.

          "Affiliate"  shall mean, with respect to any Person,  any other Person
which,  directly or indirectly,  is in control of, is controlled by, or is under
common control with, such Person.

          "Beneficially Own", with respect to any securities,  shall mean having
"beneficial  ownership" of such securities (as determined pursuant to Rule 13d-3
under the Exchange Act),  including  pursuant to any  agreement,  arrangement or
understanding, whether or not in writing.

          "Capitalized Lease"  shall mean, with respect to any Person, any lease
or any  other  agreement  for the use of  property  which,  in  accordance  with
generally accepted accounting principles,  should be capitalized on the lessee's
or user's balance sheet.

          "Change in Control" shall mean:

               (a) the  acquisition by any  individual,  entity or group (within
the meaning of Section  13(d)(3) or 14(d)(2) of the Exchange  Act) of Beneficial
Ownership of more than 25% of the combined voting power of the then  outstanding
voting  securities of the Company  entitled to vote generally in the election of
directors,  but  excluding,  for this purpose,  any such  acquisition by (i) the
Company or any of its  Subsidiaries,  (ii) any employee benefit plan (or related
trust) of the Company or its Subsidiaries, or (iii) any corporation with respect
to which, following such acquisition, a majority of the combined voting power of
the then  outstanding  voting  securities of such  corporation  entitled to vote
generally in the election of directors is then Beneficially  Owned,  directly or
indirectly, by individuals and entities who were the Beneficial Owners of voting
securities of the Company immediately prior to such acquisition in substantially
the same proportion as their ownership,  immediately  prior to such acquisition,
of the combined voting power of the then  outstanding  voting  securities of the
Company entitled to vote generally in the election of directors; or

               (b) a reorganization, merger or consolidation, in each case, with
respect to which all or substantially  all the individuals and entities who were
the  respective  Beneficial  Owners  of the  voting  securities  of the  Company
immediately  prior  to such  reorganization,  merger  or  consolidation  do not,
following  such  reorganization,   merger  or  consolidation  Beneficially  Own,
directly or indirectly,  more than 75% of the combined  voting power of the then
outstanding  voting  securities  entitled to vote  generally  in the election of
directors  of the  corporation  resulting  from such  reorganization,  merger or
consolidation; or

               (c) the sale or other  disposition  of a majority  or more of the
consolidated  assets or  property of the  Company  and its  Subsidiaries  in one
transaction or series of related transactions.

          "Code" shall mean the Internal Revenue Code of 1986, as amended.

          "ERISA"  shall mean the  Employee  Retirement  Income  Security Act of
1974, as amended.

                                      -24-

<PAGE>

                                                             Page 37 of 87 Pages


          "Exchange  Act" shall mean the  Securities  Exchange  Act of 1934,  as
amended, or any successor federal statute,  and the rules and regulations of the
Commission thereunder, all as the same shall be in effect at the time. Reference
to a  particular  section of the  Exchange  Act shall  include  reference to the
comparable section, if any, of any such successor federal statute.

          "Guarantee"  by any Person  shall  mean all  obligations  (other  than
endorsements  in the ordinary  course of business of negotiable  instruments for
deposit or collection) of any Person  guaranteeing,  or in effect  guaranteeing,
any Indebtedness, dividend or other obligation of any other Person (the "primary
obligor") in any manner,  whether  directly or  indirectly,  including,  without
limitation,  all  obligations  incurred  through  an  agreement,  contingent  or
otherwise,  by such Person:  (i) to purchase such  Indebtedness or obligation or
any property or assets constituting security therefor, (ii) to advance or supply
funds (x) for the purchase or payment of such Indebtedness or obligation, (y) to
maintain  working  capital or other  balance  sheet  condition  or  otherwise to
advance or make available funds for the purchase or payment of such Indebtedness
or  obligation,  (iii) to lease  property  or to  purchase  securities  or other
property or  services  primarily  for the purpose of assuring  the owner of such
Indebtedness or obligation of the ability of the primary obligor to make payment
of such Indebtedness or obligation, or (iv) otherwise to assure the owner of the
Indebtedness  or  obligation  of the  primary  obligor  against  loss in respect
thereof.  For the  purposes of any  computations  made under this  Agreement,  a
Guarantee in respect of any  Indebtedness  for borrowed money shall be deemed to
be Indebtedness equal to the outstanding amount of the Indebtedness for borrowed
money  which  has been  guaranteed,  and a  Guarantee  in  respect  of any other
obligation or liability or any dividend shall be deemed to be Indebtedness equal
to the maximum aggregate amount of such obligation, liability or dividend.

          "Indebtedness"  shall  mean,  with  respect  to any  Person,  (i)  all
obligations  of such Person for borrowed  money,  or with respect to deposits or
advances of any kind,  (ii) all  obligations of such Person  evidenced by bonds,
debentures,  notes or similar instruments,  (iii) all obligations of such Person
under conditional sale or other title retention  agreements relating to property
purchased by such Person,  (iv) all obligations of such Person issued or assumed
as the  deferred  purchase  price of property or services  (other than  accounts
payable to suppliers and similar  accrued  liabilities  incurred in the ordinary
course of business  and paid in a manner  consistent  with  industry  practice),
(v) all  Indebtedness  of others  secured  by (or for  which the  holder of such
Indebtedness has an existing right,  contingent or otherwise,  to be secured by)
any lien or  security  interest  on  property  owned or  acquired by such Person
whether or not the  obligations  secured  thereby  have been  assumed,  (vi) all
Capitalized  Lease  obligations  of such Person,  (vii) all  Guarantees  of such
Person,  (viii) all  obligations  (including  but not  limited to  reimbursement
obligations)  relating  to the  issuance of letters of credit for the account of
such Person, (ix) all obligations arising out of foreign exchange contracts, and
(x) all obligations  arising out of interest rate and currency swap  agreements,
cap, floor and collar  agreements,  interest rate  insurance,  currency spot and
forward  contracts  and other  agreements  or  arrangements  designed to provide
protection against fluctuations in interest or currency exchange rates.

          "Law"  shall  mean  any  law,  statute,  rule,  regulation,  judgment,
injunction, order, decree, license, permit, certificate, or other restriction of
any Governmental Authority or securities authority or exchange applicable to the
Company.

          "Material  Adverse Effect" shall mean a material adverse effect on the
business,  operations,  results of  operations,  assets,  prospects or condition
(financial or otherwise)  of the Company or the Fruit  Processing  Operations or
the Juice and Oil Operations.

                                      -25-
<PAGE>

                                                             Page 38 of 87 Pages

          "PBGC" shall mean the Pension  Benefit  Guaranty  Corporation,  or any
successor thereto.

          "Pension Plan" shall mean any  multiemployer  plan or single  employer
plan, as defined in Section 4001 of ERISA, that is subject to Title IV of ERISA,
that the Company,  any Subsidiary or any ERISA Affiliate maintains or is or ever
has been  obligated  to  contribute  to for the benefit of  employees  or former
employees of the Company, any Subsidiary or any ERISA Affiliate.

          "Permitted  Liens" shall mean liens or other  encumbrances for current
Taxes not yet due and payable, or for mechanics',  carriers', workers' and other
similar  liens or  encumbrances  arising  in the  ordinary  course  of  business
consistent  with past  practice,  except  for such liens or  encumbrances  that,
individually or in the aggregate, have or would reasonably be expected to have a
Material Adverse Effect.

          "Person" shall mean any individual, firm, corporation,  partnership or
other  entity,  and shall include any successor (by merger or otherwise) of such
entity.

          "Securities Act" shall mean the Securities Act of 1933, as amended, or
any successor  federal statute,  and the rules and regulations of the Commission
thereunder,  all as the same  shall be in  effect at the  time.  Reference  to a
particular  section  of  the  Securities  Act  shall  include  reference  to the
comparable section, if any, of any such successor federal statute.

          "Significant  Shareholder" shall mean any individual,  entity or group
(within the meaning of Section  13(d)(3) or 14(d)(2) of the  Exchange  Act) that
Beneficially Owns 5% or more of the Common Stock).

          "Subsidiary"  shall mean any  corporation or other entity of which 25%
or more of the voting power or equity interest is owned, directly or indirectly,
by the Company.

          "Third Party" shall mean, with respect to any Person, any other Person
which is not an Affiliate of such Person.

          "Treasury  Regulations"  shall mean the regulations  promulgated under
the Code from time to time.
 
          7.2.  Index to  Defined  Terms.  The terms  listed  below are  defined
elsewhere in this Agreement and, for ease of reference,  the Section  containing
the definition of each such term is set forth opposite such term:

Action.................................................................2.10(a)
Affiliate..............................................................7.1
Agreement..............................................................Preamble
Beneficially Own.......................................................7.1
Capital Lease..........................................................7.1
Change in Control......................................................7.1
Closing................................................................1.3
Code...................................................................7.1
Commission.............................................................2.3
Common Stock...........................................................Recitals
Company................................................................Preamble
Company Options........................................................2.3

                                      -26-

<PAGE>
                                                             Page 39 of 87 Pages


Contract...............................................................2.16
Employee Plan..........................................................2.12
Environmental Law......................................................2.14
Environmental Permit...................................................2.14
ERISA..................................................................7.1
ERISA Affiliate........................................................2.12
Exchange Act...........................................................7.1
Governmental Authority.................................................2.5(d)
Guarantee..............................................................7.1
Hazardous Materials....................................................2.14
Indebtedness...........................................................7.1
Indemnification Period.................................................6.1
Indemnitee.............................................................6.1
Indemnitor.............................................................6.1
Intellectual Property Rights...........................................2.15
Law....................................................................7.1
Letter Agreement.......................................................Recitals
Litigation.............................................................8.11
Losses.................................................................6.2(a)
Material Adverse Effect................................................7.1
Multiemployer Plan.....................................................2.12
Options................................................................Recitals
Option Agreements......................................................Recitals
Other Claim............................................................6.3(b)
Other Claim Notice.....................................................6.3(b)
Ownership Fraction.....................................................6.4(d)
PBGC...................................................................7.1
Pension Plan...........................................................7.1
Person.................................................................7.1
Primary Shares.........................................................Recitals
Purchase Price.........................................................1.2
Purchaser..............................................................Preamble
Purchaser Designee.....................................................4.2(a)
Registration Rights Agreement..........................................Recitals
SEC Documents..........................................................2.6
Securities Act.........................................................7.1
Significant Shareholder ...............................................7.1
Subsidiary.............................................................7.1
Tax....................................................................2.8(c)
Tax Returns............................................................2.8(c)
Third Party............................................................7.1
Third Party Claim......................................................6.3(a)
Third Party Claim Notice...............................................6.3(a)
Transfer...............................................................5
Treasury Regulations ..................................................7.1
Valid Claim Notice.....................................................6.1
Valid Other Claim Notice...............................................6.3(b)
Valid Third Party Claim Notice.........................................6.3(a)
 

          7.3. Headings; Other Interpretation. The heading references herein and
the  table  of  contents  hereto  are  for  convenience  purposes  only,  do not
constitute a part of this  Agreement  and shall not be deemed to limit or affect
any of the provisions hereof.  "Hereby," "hereof," "hereunder" and similar terms

                                      -27-

<PAGE>

                                                             Page 40 of 87 Pages


shall be references to this Agreement,  including the Schedules  hereto. In this
Agreement,  unless the context otherwise requires,  words in the singular number
or in the plural  number shall each  include the singular  number and the plural
number. As used herein,  to a party's  "knowledge" means actual knowledge of the
senior  management  and board of directors of the Company and the knowledge that
any of the foregoing persons would have after due and reasonable inquiry. Unless
the context otherwise  indicates,  references to a Section,  Article or Schedule
shall  refer  (respectively)  to a Section  of,  Article of or  Schedule to this
Agreement.  The term  "dollars" or "$" shall refer to the currency of the United
States.

8.       Miscellaneous.

          8.1. Severability.  If any term, provision, covenant or restriction of
this  Agreement  or  any  exhibit  hereto  is  held  by  a  court  of  competent
jurisdiction to be invalid,  void or unenforceable,  the remainder of the terms,
provisions, covenants and restrictions of this Agreement and such exhibits shall
remain in full  force and effect and shall in no way be  affected,  impaired  or
invalidated.  It is hereby  stipulated  and declared to be the  intention of the
parties that they would have executed the remaining terms, provisions, covenants
and restrictions  without including any of such which may be hereafter  declared
invalid,  void or  unenforceable.  Should  a  court  of  competent  jurisdiction
determine that any provision hereof is unenforceable  because it is excessive in
scope,  the parties  hereto agree that the provision  shall be  interpreted  and
enforced to the maximum extent which such court deems enforceable.

          8.2.  Specific  Enforcement.  Purchaser,  on the  one  hand,  and  the
Company, on the other, acknowledge and agree that irreparable damage would occur
in the event that any of the  provisions of this Agreement were not performed in
accordance  with  their  specific  terms  or  were  otherwise  breached.  It  is
accordingly  agreed that the  parties  shall be  entitled  to an  injunction  to
prevent breaches of the provisions of this Agreement and to enforce specifically
the terms and  provisions  hereof in any court of the United States or any state
thereof having jurisdiction, this being in addition to any other remedy to which
they may be entitled at law or equity.

          8.3.  Entire  Agreement.   This  Agreement  (including  the  schedules
hereto), the Option Agreements,  the Registration Rights Agreement and the other
documents delivered in connection herewith or contemplated herein constitute the
entire  agreement  between the parties and  supersede all prior  agreements  and
understandings, agreements or representations by or between the parties, written
and oral,  with respect to the subject matter hereof and thereof.  Purchaser and
the Company hereby terminate the Letter Agreement.

          8.4.  Counterparts.  This  Agreement  may be  executed  in one or more
counterparts,  all of which shall be considered one and the same agreement,  and
shall become effective when one or more of the counterparts  have been signed by
each party and  delivered to the other  parties,  it being  understood  that all
parties need not sign the same counterpart.

                                      -28-

<PAGE>

                                                             Page 41 of 87 Pages


          8.5.  Notices  and  Other  Communications.   All  notices,   consents,
requests,  instructions,  approvals,  financial  statements,  proxy  statements,
reports and other  communications  provided  for herein  shall be in writing and
shall be delivered personally,  by telecopy (and confirmed by telephone) or sent
by prepaid overnight courier service, to the applicable address set forth below.



                  If to the Company, to:
 
                  The UniMark Group, Inc.
                  The UniMark House
                  P.O. Box 229
                  Argyle, TX  76226
                  Attention: President
                  Telecopier:
 
         with a copy to:

         Jakes Jordaan, Esq.
         Jordaan & Pennington
         300 Crescent Court, Suite 1605
         Dallas, TX 75201
         Telecopier: (214) 871-6560

         If to Purchaser, to:
 
         M & M Nominee L.L.C.
         c/o Soros Fund Management
         888 Seventh Avenue
         New York, NY  10106
         Attention: Chief Financial Officer
         Telecopier: (212) 974-8399
 
         with a copy to:
 
         Promecap, S.C.
         Bosque de Alisos No. 47A, 3er piso
         Colonia Bosques de las Lomas
         C.P. 05120 Mexico, D.F.
         Mexico
         Attention: Federico Chavez Peon
         Telecopier: 011-525-259-6269
 
         with a copy to:

         Joseph Stern, Esq.
         Fried, Frank, Harris, Shriver & Jacobson
         One New York Plaza
         New York, New York  10004
         Telecopier: (214) 859-4000

or to such other  address as any party may,  from time to time,  designate  in a
written notice given in a like manner.

                                      -29-

<PAGE>
                                                             Page 42 of 87 Pages


          8.6.  Amendments;  Termination;  Waivers.  This  Agreement  may not be
amended or terminated  except by written agreement of the Company and Purchaser.
This Agreement may not be waived,  changed,  modified, or discharged orally, but
only by an  agreement  in writing  signed by the party or parties  against  whom
enforcement  of  any  waiver,  change,  modification  or  discharge  is  sought.
Notwithstanding anything in this Agreement to the contrary, no provision of this
Section 8.6 may be waived, changed or modified.

          8.7. Cooperation. Purchaser and the Company agree to take, or cause to
be taken,  all such further or other actions as shall reasonably be necessary to
make effective and consummate the transactions contemplated by this Agreement.

          8.8. Successors and Assigns;  Parties in Interest.  This Agreement may
be assigned by Purchaser to any  Affiliate of Purchaser who agrees in writing to
be bound by the  provisions  hereof.  This  Agreement may not be assigned by the
Company.  All covenants and agreements  contained herein shall bind and inure to
the benefit of the parties hereto and their  respective  successors and assigns.
In addition,  each Purchaser Designee shall be a third party beneficiary of this
Agreement and shall be entitled to enforce this Agreement. Except as provided in
the preceding two sentences and as explicitly  provided in Article 6, nothing in
this  Agreement,  express or implied,  is intended to confer upon any Person any
rights or remedies under or by reason of this Agreement.

          8.9.  Expenses.  The  Company  shall  pay all costs  and  expenses  of
Purchaser  and its  Affiliates  (including  fees and  expenses  of  counsel  and
accountants) in connection with their due diligence  review of the Company,  the
negotiation,  execution and delivery of the Letter Agreement, this Agreement and
all other documents in connection herewith,  and the closing of the transactions
contemplated  hereby,  up to a  maximum  of  $100,000,  and  shall pay costs and
expenses of Purchaser and its Affiliates (including fees and expenses of counsel
and accountants) of their enforcement of the foregoing.

                                      -30-
<PAGE>
                                                             Page 43 of 87 Pages


          8.10.  Transfer of Shares.  (a) Purchaser  understands and agrees that
the Primary  Shares have not been  registered  under the  Securities  Act or the
securities laws of any state and that they may be sold or otherwise  disposed of
only in one or more transactions  registered under the Securities Act and, where
applicable,  such  laws or  transactions  as to  which  an  exemption  from  the
registration requirements of the Securities Act and, where applicable, such laws
are  available.   Purchaser   acknowledges  that,  except  as  provided  in  the
Registration Rights Agreement,  Purchaser has no right to require the Company to
register  the  Primary  Shares.  Purchaser  understands  and  agrees  that  each
certificate  representing the Primary Shares shall bear legends substantially in
the form as follows:

                    "THE  SECURITIES  REPRESENTED BY THIS  CERTIFICATE  HAVE NOT
               BEEN  REGISTERED   UNDER  THE  SECURITIES  ACT  OF  1933  OR  THE
               SECURITIES  LAWS OF ANY  STATE  AND MAY NOT BE SOLD OR  OTHERWISE
               DISPOSED  OF  EXCEPT   PURSUANT  TO  AN  EFFECTIVE   REGISTRATION
               STATEMENT UNDER SUCH ACT AND APPLICABLE  STATE SECURITIES LAWS OR
               AN APPLICABLE EXEMPTION TO THE REGISTRATION  REQUIREMENTS OF SUCH
               ACT OR SUCH LAWS."

 
          8.11. Governing Law; Consent to Jurisdiction.  THIS AGREEMENT SHALL BE
GOVERNED BY AND CONSTRUED IN  ACCORDANCE  WITH THE LAWS OF THE STATE OF DELAWARE
WITHOUT GIVING EFFECT TO THE PRINCIPLES OF CONFLICTS OF LAW. EACH OF THE PARTIES
HERETO  HEREBY  IRREVOCABLY  AND  UNCONDITIONALLY  CONSENTS  TO  SUBMIT  TO  THE
EXCLUSIVE  JURISDICTION OF THE COURTS OF THE STATE OF DELAWARE AND OF THE UNITED
STATES OF AMERICA, IN EACH CASE LOCATED IN WILMINGTON,  DELAWARE, FOR ANY ACTION
IN ANY COURT OR BEFORE ANY GOVERNMENTAL AUTHORITY  ("LITIGATION") ARISING OUT OF
OR RELATING TO THIS  AGREEMENT  AND THE  TRANSACTIONS  CONTEMPLATED  HEREBY (AND
AGREES NOT TO COMMENCE ANY LITIGATION  RELATING  THERETO EXCEPT IN SUCH COURTS).
EACH OF THE PARTIES HERETO HEREBY  IRREVOCABLY  AND  UNCONDITIONALLY  WAIVES ANY
OBJECTION TO THE LAYING OF VENUE OF ANY LITIGATION ARISING OUT OF THIS AGREEMENT
OR THE TRANSACTIONS  CONTEMPLATED  HEREBY IN THE COURTS OF THE STATE OF DELAWARE
OR THE UNITED STATES OF AMERICA,  IN EACH CASE LOCATED IN WILMINGTON,  DELAWARE,
AND HEREBY  FURTHER  IRREVOCABLY  AND  UNCONDITIONALLY  WAIVES AND AGREES NOT TO
PLEAD OR CLAIM IN ANY SUCH  COURT THAT ANY SUCH  LITIGATION  BROUGHT IN ANY SUCH
COURT HAS BEEN BROUGHT IN AN INCONVENIENT FORUM. EACH OF THE PARTIES IRREVOCABLY
AND  UNCONDITIONALLY  WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW,
ANY AND ALL RIGHTS TO TRIAL BY JURY IN CONNECTION  WITH ANY  LITIGATION  ARISING
OUT OF OR RELATING TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY.

          8.12. Publicity

          Each of the  parties  hereto  agrees  that it will  make no  statement
regarding the transactions  contemplated  hereby which is inconsistent  with the
press release agreed to by the parties  hereto.  Notwithstanding  the foregoing,
each of the parties hereto may, in documents required to be filed by it with the
Commission or other regulatory bodies,  make such statements with respect to the
transactions  contemplated  hereby as each may be advised  is legally  necessary
upon advice of its counsel.

          [Remainder of page left intentionally blank.]

                                      -31-

<PAGE>
                                                             Page 44 of 87 Pages

           
          IN WITNESS  WHEREOF,  the  Company  and  Purchaser  have  caused  this
Agreement to be executed and  delivered by their  respective  officers as of the
date first above written.


                                   THE UNIMARK GROUP, INC.

                                   By:/s/ Rafael Vaquero Bazan
                                      ----------------------------------------
                                      Name:  Rafael Vaquero Bazan
                                      Title: President, Chief Executive Officer
                                             and Chief Operating Officer



                                   M & M NOMINEE L.L.C.

                                   By:/s/ Peter Streinger
                                      ----------------------------------------
                                      Name:  Peter Streinger
                                      Title: Manager

                                      -32-



                                                             Page 45 of 87 Pages


                                    EXHIBIT C

                          FIRST STOCK OPTION AGREEMENT

          FIRST STOCK OPTION AGREEMENT (this "First Option  Agreement") dated as
of  July 17,  1998,  by and  between M & M NOMINEE  L.L.C.,  a Delaware  limited
liability  company   ("Purchaser"),   and  THE  UNIMARK  GROUP,  INC.,  a  Texas
corporation (the "Company").

                               W I T N E S S E T H

          WHEREAS,  the  Board  of  Directors  of  Purchaser  and the  Board  of
Directors of the Company  have  approved a Purchase  Agreement  dated as of even
date  herewith  (the  "Purchase  Agreement")  providing  for the issuance by the
Company and the purchase by Purchaser of shares of common stock, par value $0.01
per share, of the Company (the "Common Stock");

          WHEREAS, to induce Purchaser to enter into the Purchase Agreement, the
Company has agreed to (i) grant to  Purchaser  an option  pursuant to the Second
Option Agreement, by and between Purchaser and the Company, dated as of the date
hereof (the "Second Option  Agreement"),  and (ii) grant to Purchaser the option
set forth herein to purchase authorized but unissued shares of Common Stock.

          NOW,  THEREFORE,  to  induce  Purchaser  to enter  into  the  Purchase
Agreement and in  consideration  of the premises herein  contained,  the parties
agree as follows:

1.  Definitions.  Capitalized  terms used but not defined  herein shall have the
same meanings as in the Purchase Agreement.

     Grant of Option.  Subject to the terms and conditions set forth herein, the
Company  hereby  grants to Purchaser an option (the  "Option") to purchase up to
1,000,000  authorized and unissued shares of Common Stock (the "Option Shares"),
at a price per share equal to $4.5375 (the "Exercise  Price") payable in cash as
provided in Section 4 hereof.

3. Exercise of Option.  (a)  Purchaser  may exercise the Option,  in whole or in
part, at any time or from time to time during the Exercise Period. The "Exercise
Period"  shall be the period from the date hereof until and  including the first
anniversary of the date hereof.  Except as provided by the last sentence of this
Section  3(a), at 11:59 p.m.  (Dallas,  TX time) on the last day of the Exercise
Period  the  Option,  to the  extent  it shall not have  been  exercised,  shall
terminate  and be of no  further  force  and  effect.  If the  Option  cannot be
exercised  prior to the first  anniversary of the date hereof as a result of any
injunction,  order or other legal restraint (each, a "Restraint"),  the Exercise
Period  shall  terminate on the later of (i) the first  anniversary  of the date
hereof  and (ii) the 10th  business  day after  such  Restraint  shall have been
dissolved or shall have become permanent and no longer subject to appeal, as the
case may be, but in no event later than 18 months after the date hereof.  If, at
the end of the Exercise Period,  such Restraint shall not have been dissolved or
otherwise  resolved (to the reasonable  satisfaction  of Purchaser) to allow the
exercise of the Option,  then, upon written request made by Purchaser  within 14
days of the end of the Exercise Period,  the Company shall redeem the Option for
a  redemption  price  equal to (x) the excess of the  Current  Market  Price (as
defined in Section 6) of the  Common  Stock as of the first  anniversary  of the
date hereof over the Exercise Price, multiplied by (y) the number of shares that
would be issued upon exercise of the Option but for the Restraint.

<PAGE>
                                                             Page 46 of 87 Pages

     (b) Whenever  Purchaser wishes to exercise the Option,  it shall deliver to
the Company a written notice (the  'Notice",  the date of receipt of which being
herein  referred to as the "Notice  Date")  specifying  (i) the total  number of
shares it intends to purchase  pursuant to such  exercise,  and (ii) a place and
date not earlier than two business days nor later than 60 calendar days from the
Notice Date for the closing of such purchase (a "Closing  Date");  provided that
if any closing of the  purchase  and sale  pursuant to the Option (a  "Closing")
cannot be consummated  by reason of any applicable  Law, the period of time that
otherwise  would run from the Notice Date  pursuant to this  sentence  shall run
instead from the date on which such  restriction on consummation  has expired or
been terminated;  and provided further that, without limiting the foregoing,  if
prior  notification to or approval of any Governmental  Authority is required in
connection with such purchase,  Purchaser and, if applicable,  the Company shall
promptly  file the  required  notice  or  application  for  approval  and  shall
expeditiously  process the same (and the Company shall  cooperate with Purchaser
in the filing of any such notice or  application  and the  obtaining of any such
approval),  and the period of time that otherwise would run from the Notice Date
pursuant to this sentence shall run instead from the date on which,  as the case
may be, (i) any required  notification  period has expired or been terminated or
(ii) such approval has been obtained, and in either event, any requisite waiting
period  has  passed.  If  such  notification  period  has  not  expired  or been
terminated or such approval has not been  obtained,  or such waiting  period has
not  passed,  in any case the effect of which is to prevent or delay the Closing
for 90 days beyond the Notice Date, then, upon written request made by Purchaser
within 14 days of the end of such 90 day period,  the Company  shall  redeem the
Option for a  redemption  price  equal to (x) the excess of the  Current  Market
Price of the Common  Stock as of the first  anniversary  of the date hereof over
the  Exercise  Price,  multiplied  by (y) the number of shares  specified in the
Notice.
 
     (c) In connection with any Closing,  the Company may request that Purchaser
represent that, as of the Closing Date applicable to such Closing, (i) Purchaser
is an  "accredited  investor"  within the meaning of Rule 501 of the  Securities
Act, and  (ii) Purchaser  is acquiring the Option Shares being purchased at such
Closing  for the  purpose  of  investment  and not with a view to or for sale in
connection with any  distribution  thereof.  If the Company makes such a request
and Purchaser  fails to make such  representations,  then (except as provided in
the  following  sentence)  the Company  shall have no  obligation to effect such
Closing. Purchaser may, in lieu of making the representation set forth in clause
(i), furnish the Company with an opinion of counsel reasonably acceptable to the
Company, to the effect that the acquisition of the Option Shares at such Closing
is exempt  from  registration  under the  Securities  Act and  applicable  state
securities laws.  Notwithstanding  the foregoing purchaser shall not be required
to make the  representation  set forth in  clause  (i) or  furnish  such a legal
opinion if purchaser is exercising the Option and immediately thereafter selling
the Option Shares pursuant to the Registration Rights Agreement.

4. Payment and Delivery of  Certificates.  (a) At each Closing,  Purchaser shall
pay to the Company the aggregate  Exercise Price for the Option Shares purchased
at such Closing pursuant to the exercise of the Option in immediately  available
funds by wire transfer to a bank account  designated not later than one business
day prior to the Closing Date for such Closing by the Company.

     (b) At such  Closing,  simultaneously  with the  delivery of the  aggregate
Exercise Price as provided in Section 4(a)  hereof, the Company shall deliver to
Purchaser a certificate or certificates representing the number of Option Shares
then being  purchased by  Purchaser,  registered  in the name of Purchaser or as
designated in writing by Purchaser,  which Option Shares shall be fully paid and
nonassessable and free and clear of all liens, claims,  charges and encumbrances
of any kind whatsoever.

                                      - 2 -
<PAGE>
                                                             Page 47 of 87 Pages


     (c) If at the  time  of  issuance  of any  Option  Shares  pursuant  to any
exercise of the Option,  the Company shall have issued any share purchase rights
or similar  securities  ("Rights")  to holders of any class of the Common Stock,
then each such Option Share shall also represent Rights with terms substantially
the same as and at least as  favorable  to  Purchaser  as those  issued to other
holders of the Common Stock.

     (d) Certificates for Option Shares delivered at any Closing hereunder shall
be  endorsed  with a  restrictive  legend,  which  shall read  substantially  as
follows:

          "The  securities   represented  by  this  certificate  have  not  been
          registered  under the Securities Act of 1933 or the securities laws of
          any state and may not be sold or otherwise disposed of except pursuant
          to an effective  registration  statement under such act and applicable
          state  securities laws or an applicable  exemption to the registration
          requirements of such act or such laws."

It is  understood  and agreed that the above legend shall be removed by delivery
of substitute  certificate(s)  without such legend in connection with a transfer
or sale if (i) the  Company  has been  furnished  with an  opinion  of  counsel,
reasonably  satisfactory to counsel for the Company,  that such transfer or sale
will not violate the Securities Act or applicable  securities  laws of any state
or (ii) such transfer or sale shall have been registered and qualified  pursuant
to the Securities Act and any applicable state securities laws.

5. Representations and Warranties;  Covenants. (a) The Company hereby represents
and warrants to Purchaser that: (i) the Company has full corporate right,  power
and authority to execute and deliver this First Option  Agreement and to perform
all of its obligations hereunder; (ii) such execution,  delivery and performance
have been duly authorized by the Board of Directors of the Company, and no other
corporate proceedings are necessary therefor;  (iii) this First Option Agreement
has been duly and validly executed and delivered by the Company and represents a
valid and legally  binding  obligation of the Company,  enforceable  against the
Company  in  accordance  with its  terms;  and (iv) the  Company  has  taken all
necessary  corporate action to authorize and reserve and permit it to issue, and
at all times from the date hereof  through  the date of the  exercise in full or
the expiration or  termination  of the Option,  shall have reserved for issuance
upon  exercise  of the  Option,  1,000,000  shares of Common  Stock  (subject to
adjustment as provided  herein),  all of which, upon issuance in accordance with
the terms of this First  Option  Agreement,  shall be duly  authorized,  validly
issued,  fully paid and nonassessable,  shall be delivered free and clear of all
claims,  liens,  encumbrances  and  security  interests  and not  subject to any
preemptive  rights of any  stockholder of the Company,  and will be eligible for
NASDAQ NMS trading without further consents or actions (other than  registration
thereof pursuant to the Registration Rights Agreement).

     (b)  Purchaser  hereby  represents  and  warrants to the  Company  that (i)
Purchaser has full corporate  right,  power and authority to execute and deliver
this First Option  Agreement  and to perform all of its  obligations  hereunder;
(ii) such execution,  delivery and performance  have been duly authorized by all
requisite corporate action by Purchaser,  and no other corporate proceedings are
necessary therefor;  (iii) this First Option Agreement has been duly and validly
executed and delivered by Purchaser and  represents a valid and legally  binding
obligation of Purchaser,  enforceable  against  Purchaser in accordance with its
terms;  and (iv) any Common  Stock  acquired by Purchaser  upon  exercise of the
Option will not be  transferred  or otherwise  disposed of for one year from the
date hereof and then only in compliance with the Securities Act.


                                      - 3 -
<PAGE>
                                                             Page 48 of 87 Pages


6. Adjustment upon Changes in Capitalization.  (a) In the event of any change in
the Common Stock by reason of stock dividends,  stock splits,  recapitalizations
or the like,  the type and  number  of  shares  subject  to the  Option  and the
Exercise Price shall be adjusted appropriately.

     (b) If at any time  following  the date  hereof,  the  Company  shall issue
shares of Common Stock (or rights, warrants or other securities convertible into
or  exchangeable   for  shares  of  Common  Stock   (collectively   "Convertible
Securities")) at a price per share (or having a conversion price per share) less
than the Current Market Price (as defined below) per share of Common Stock as of
the date of issuance of such shares (or, in the case of Convertible  Securities,
less than the Current Market Price as of the date of issuance of the Convertible
Securities  in respect of which  shares of Common Stock were  issued),  then the
Exercise Price shall be adjusted by multiplying (A) the Exercise Price in effect
on the day immediately  prior to such date by (B) a  fraction,  the numerator of
which shall be the sum of (1) the  number of shares of Common Stock  outstanding
on such date and (2) the  number of shares of Common  Stock  purchasable  at the
then Current Market Price per share with the aggregate consideration  receivable
by the Company for the total number of shares of Common Stock so issued (or into
which the  Convertible  Securities  may convert),  and the  denominator of which
shall be the sum of (x) the number of shares of Common Stock outstanding on such
date and (y) the  number of  additional  shares of Common  Stock issued (or into
which the Convertible Securities may convert).

     An adjustment made pursuant to this Section 6(b)  shall be made on the next
business day  following the date on which any such issuance is made and shall be
effective  retroactively  to the close of business on the date of such issuance.
For purposes of this Section 6(b), the aggregate consideration receivable by the
Company  in  connection  with the  issuance  of  shares  of  Common  Stock or of
Convertible  Securities  shall be deemed to be equal to the sum of the aggregate
offering price (before  deduction of  underwriting  discounts or commissions and
expenses  payable to third  parties)  of all such Common  Stock and  Convertible
Securities plus the minimum  aggregate  amount, if any, payable upon exercise or
conversion of any such Convertible Securities. The issuance or reissuance of any
shares of Common Stock (whether treasury shares or newly issued shares) pursuant
to  (i) a  dividend  or  distribution   on,  or   subdivision,   combination  or
reclassification  of,  the  outstanding  shares of  Common  Stock  requiring  an
adjustment in the Exercise  Price  pursuant to  Section 6(a),  or (ii) any stock
option plan,  stock  purchase  plan or other  benefit  program of the Company or
executive  compensation  package  approved by the  Company's  Board of Directors
involving  the grant of options to employees  or directors of the Company  shall
not be  deemed  to  constitute  an  issuance  of  Common  Stock  or  Convertible
Securities  by  the  Company  to  which  this  Section 6(b)  applies.  Upon  the
expiration unexercised of any Convertible Securities for which an adjustment has
been made pursuant to this  Section 6(b),  the  adjustments  shall  forthwith be
reversed to effect such rate of  conversion  as would have been in effect at the
time of such expiration or termination had such Convertible  Securities,  to the
extent  outstanding  immediately prior to such expiration or termination,  never
been issued.

     "Current  Market  Price",  when used with reference to shares of the Common
Stock or  another  security  on any date,  shall  mean the  average of the daily
closing  prices  per share of such  Common  Stock or other  security  for the 20
preceding  trading days. If the Common Stock or such other securities are listed
or  admitted to trading on a national  securities  exchange,  the closing  price
shall be the last sale price,  regular way, or, in case no such sale takes place
on such day,  the average of the closing bid and asked  prices,  regular way, in
either case as  reported in the  principal  consolidated  transaction  reporting
system with respect to securities  listed or admitted to trading on the New York
Stock  Exchange or, if the Common Stock or such other  securities are not listed
or  admitted  to trading  on the New York Stock  Exchange,  as  reported  in the
principal  consolidated  transaction reporting system with respect to securities

                                      -4-
<PAGE>

                                                             Page 49 of 87 Pages


listed on the principal national  securities  exchange on which the Common Stock
or such other  securities  are listed or  admitted  to trading or, if the Common
Stock or such  other  securities  are not so listed on any  national  securities
exchange,  as  reported  in  the  transaction  reporting  system  applicable  to
securities  designated as a "national market system security" or NASDAQ.  If the
Common  Stock or such other  securities  are not  publicly  held or so listed or
designated,  "Current Market Price" shall mean the Fair Market Value (as defined
below) per share of Common Stock or of such other  securities  as  determined in
good faith by the Board of  Directors  of the Company  based on an opinion of an
independent investment banking firm with an established national reputation with
respect to the valuation of securities.

     "Fair Market Value"  shall mean,  as to shares of Common Stock or any other
securities  of the Company or any other issuer which are  publicly  traded,  the
Current Market Prices of such shares or  securities.  The "Fair Market Value" of
any security  which is not publicly  traded or of any other  property shall mean
the fair value  thereof as determined by an  independent  investment  banking or
appraisal  firm  experienced  in the  valuation of such  securities  or property
selected in good faith by the Board of Directors of the Company.

     (c) In case the  Company  shall at any time or from time to time  after the
date  hereof  declare,  order,  pay or make a  dividend  or  other  distribution
(including, without limitation, any distribution of stock or other securities or
property or Convertible  Securities of the Company or any of its Subsidiaries by
way of dividend or spinoff),  on its Common Stock,  then, and in each such case,
the Exercise Price shall be adjusted by multiplying  (1) the applicable Exercise
Price  on  the  day  immediately   prior  to  the  record  date  fixed  for  the
determination of stockholders  entitled to receive such dividend or distribution
by (2) a  fraction,  the numerator of which shall be the Current Market Price of
the Common  Stock less the Fair Market  Value of such  dividend or  distribution
(per share of Common Stock),  and the denominator of which shall be such average
Current  Market Price of the Common Stock.  If any dividend or  distribution  is
declared  or  ordered  and a Closing  Date is before  the  record  date for such
dividend or distribution, then no adjustment in respect thereof shall be made to
the Exercise  Price with respect to the Option  Shares  acquired on such Closing
Date.

     (d) For purposes of this Section 6, the number of shares of Common Stock at
any time outstanding  shall not include any shares of Common Stock then owned or
held by or for the account of the Company.

     (e) The term  "dividend," as used in this Section 6,  shall mean a dividend
or other distribution in respect of shares of Common Stock of the Company.

     (f) Anything in this Section 6 to the contrary notwithstanding, the Company
shall not be required to give effect to any  adjustment  in the  Exercise  Price
unless and until the net effect of one or more adjustments  (each of which shall
be carried  forward),  determined  as above  provided,  shall have resulted in a
change of the Exercise  Price by at least one percent,  and when the  cumulative
net  effect of more than one  adjustment  so  determined  shall be to change the
Exercise  Price by at least one  percent,  such change in  Exercise  Price shall
thereupon be given effect.

     (g) The  certificate  of any  firm of  independent  public  accountants  of
recognized  national  standing selected by the Board of Directors of the Company
(which may be the firm of independent public  accountants  regularly employed by
the Company) shall be presumptively  correct for any computation made under this
Section 6.

                                      - 5 -
<PAGE>

                                                             Page 50 of 87 Pages


7. Registration Rights.  Contemporaneously  herewith,  Purchaser and the Company
are entering into a Registration  Rights Agreement providing for registration of
the Option Shares.

8.  Listing.  If the Common Stock or any other  securities  to be acquired  upon
exercise of the Option are then listed on any national securities exchange,  the
Company,  upon the request of Purchaser,  will promptly file an  application  to
list the Option  Shares or other  securities to be acquired upon exercise of the
Option on all such exchanges and will use its best efforts to obtain approval of
such listings as soon as practicable.

9. Survival.  The representations,  warranties,  covenants and agreements of the
parties hereto shall survive any Closing.

10. Severability. Any term, provision, covenant or restriction contained in this
First  Option  Agreement  held by a court or  other  Governmental  Authority  of
competent jurisdiction to be invalid, void or unenforceable shall be ineffective
to the extent of such invalidity, voidness or unenforceability,  but neither the
remaining terms,  provisions,  covenants or restrictions contained in this First
Option  Agreement  nor the  validity  or  enforceability  thereof  in any  other
jurisdiction  shall be  affected  or  impaired  thereby.  Any  term,  provision,
covenant or  restriction  contained  in this First Option  Agreement  that is so
found to be so broad as to be unenforceable  shall be interpreted to be as broad
as is enforceable.

11. Entire Agreement.  This First Option Agreement, the Second Option Agreement,
the Purchase Agreement  (including the documents and the instruments referred to
therein or  delivered  in  connection  therewith)  and the  Registration  Rights
Agreement  constitute the entire agreement between the parties and supersede all
prior agreements and understandings, agreements or representations by or between
the parties,  written and oral,  with respect to the subject  matter  hereof and
thereof.

12. Successors;  No Third Party Beneficiaries.  The terms and conditions of this
First  Option  Agreement  shall inure to the benefit of and be binding  upon the
parties  hereto and their  respective  successors  and assigns.  Nothing in this
First Option  Agreement,  expressed  or implied,  is intended to confer upon any
party,  other than the  parties  hereto,  and their  respective  successors  and
assigns, any rights, remedies, obligations, or liabilities under or by reason of
this First Option Agreement, except as expressly provided herein.

13. Notices. All notices or other communications which are required or permitted
hereunder  shall be in writing and  sufficient if delivered in  accordance  with
Section  8.5  of  the  Purchase  Agreement  (which  is  incorporated  herein  by
reference).

14. Further Assurances. In the event of any exercise of the Option by Purchaser,
the Company and  Purchaser  shall  execute and deliver all other  documents  and
instruments and take all other action that may be reasonably  necessary in order
to consummate the transactions provided for by such exercise.

15.  Specific  Performance.  The  parties  hereto  agree  that if for any reason
Purchaser or the Company shall have failed to perform its obligations under this
First Option  Agreement,  then either party hereto seeking to enforce this First
Option Agreement against such non-performing party shall be entitled to specific
performance  and injunctive and other equitable  relief,  and the parties hereto
further agree to waive any  requirement  for the securing or posting of any bond
in  connection  with the  obtaining of any such  injunctive  or other  equitable
relief.  This  provision  is without  prejudice  to any other rights that either
party  hereto may have against the other party hereto for any failure to perform
its obligations under this First Option Agreement.

                                      -6-
<PAGE>

                                                             Page 51 of 87 Pages


16.  Governing Law. This First Option Agreement shall be governed by the laws of
the State of Delaware,  without giving effect to the conflict of laws principles
thereof. Each party hereby irrevocably and unconditionally consents to submit to
the  exclusive  jurisdiction  of the courts of the State of Delaware  and of the
United States of America  located in  Wilmington,  Delaware,  for any Litigation
(and agrees not to commence any Litigation except in any such court). Each party
hereby  irrevocably  and  unconditionally  waives any objection to the laying of
venue of any  Action in the  courts of the State of  Delaware  or of the  United
States  of  America  located  in  Wilmington,   Delaware,   and  hereby  further
irrevocably and  unconditionally  waives and agrees not to plead or claim in any
such  court that any  Action  brought  in any such court has been  brought in an
inconvenient forum.

17. Regulatory Approvals;  Section 16(b). If, in connection with the exercise of
the  Option  under  Section  3,  prior   notification  to  or  approval  of  any
Governmental Authority is required,  then the required notice or application for
approval shall be promptly filed and/or  expeditiously  processed by the Company
and periods of time that otherwise  would run pursuant hereto (if any) shall run
instead from the date on which any such required notification period has expired
or been terminated or such approval has been obtained,  and in either event, any
requisite waiting period shall have passed. Periods of time that otherwise would
run pursuant to this First Option Agreement shall also be extended to the extent
necessary in order to avoid liability under Section 16(b) of the Exchange Act.

18. Waiver and  Amendment.  Any provision of this First Option  Agreement may be
waived in writing at any time by the party that is entitled  to the  benefits of
such  provision.  This First  Option  Agreement  may not be  modified,  amended,
altered or  supplemented  except upon the  execution  and  delivery of a written
agreement executed by the parties hereto.


                                      - 7 -
<PAGE>

                                                             Page 52 of 87 Pages


     IN WITNESS  WHEREOF,  each of the parties  hereto has  executed  this First
Option Agreement as of the date first written above.


                                   PURCHASER:

                                   M & M NOMINEE L.L.C.

                                   By:/s/ Peter Streinger
                                      --------------------------------------
                                      Name:  Peter Streinger
                                      Title: Manager


                                   THE COMPANY:

                                   THE UNIMARK GROUP, INC.

                                   By:/s/ Rafael Vaquero Bazan
                                      ---------------------------------------
                                      Name:  Rafael Vaquero Bazan
                                      Title: President, Chief Executive Officer
                                             and Chief Operating Officer


                                      - 8 -

                                                             Page 53 of 87 Pages


                                    EXHIBIT D

                          SECOND STOCK OPTION AGREEMENT

          SECOND STOCK OPTION AGREEMENT (this "Second Option  Agreement")  dated
as of July 17,  1998, by and between M & M NOMINEE  L.L.C.,  a Delaware  limited
liability  company   ("Purchaser"),   and  THE  UNIMARK  GROUP,  INC.,  a  Texas
corporation (the "Company").

                               W I T N E S S E T H

          WHEREAS,  the  Board  of  Directors  of  Purchaser  and the  Board  of
Directors of the Company  have  approved a Purchase  Agreement  dated as of even
date  herewith  (the  "Purchase  Agreement")  providing  for the issuance by the
Company and the purchase by Purchaser of shares of common stock, par value $0.01
per share, of the Company (the "Common Stock");

          WHEREAS, to induce Purchaser to enter into the Purchase Agreement, the
Company  has agreed to (i) grant to  Purchaser  an option  pursuant to the First
Option Agreement, by and between Purchaser and the Company, dated as of the date
hereof (the "First  Option  Agreement"),  and (ii) grant to Purchaser the option
set forth herein to purchase authorized but unissued shares of Common Stock;

          NOW,  THEREFORE,  to  induce  Purchaser  to enter  into  the  Purchase
Agreement and in  consideration  of the premises herein  contained,  the parties
agree as follows:

1.  Definitions.  Capitalized  terms used but not defined  herein shall have the
same meanings as in the Purchase Agreement.

     Grant of Option.  Subject to the terms and conditions set forth herein, the
Company  hereby  grants to Purchaser an option (the  "Option") to purchase up to
1,000,000  authorized and unissued shares of Common Stock (the "Option Shares"),
at a price per share equal to $4.5375 (the "Exercise  Price") payable in cash as
provided in Section 4 hereof.

3. Exercise of Option.  (a)  Purchaser  may exercise the Option,  in whole or in
part, at any time or from time to time during the Exercise Period. The "Exercise
Period"  shall be the period from the date hereof until and  including the third
anniversary of the date hereof.  Except as provided by the last sentence of this
Section  3(a), at 11:59 p.m.  (Dallas,  TX time) on the last day of the Exercise
Period  the  Option,  to the  extent  it shall not have  been  exercised,  shall
terminate  and be of no  further  force  and  effect.  If the  Option  cannot be
exercised  prior to the third  anniversary of the date hereof as a result of any
injunction,  order or other legal restraint (each, a "Restraint"),  the Exercise
Period  shall  terminate on the later of (i) the third  anniversary  of the date
hereof  and (ii) the 10th  business  day after  such  Restraint  shall have been
dissolved or shall have become permanent and no longer subject to appeal, as the
case may be, but in no event  later than  three  years and six months  after the
date hereof.  If, at the end of the Exercise  Period,  such Restraint  shall not
have been  dissolved or otherwise  resolved (to the reasonable  satisfaction  of
Purchaser) to allow the exercise of the Option,  then, upon written request made
by Purchaser within 14 days of the end of the Exercise Period, the Company shall
redeem the Option for a redemption  price equal to (x) the excess of the Current
Market  Price (as  defined in  Section  6) of the  Common  Stock as of the third
anniversary  of the date hereof over the Exercise  Price,  multiplied by (y) the
number of shares  that would be issued  upon  exercise of the Option but for the
Restraint.

                                      -1-
<PAGE>
                                                             Page 54 of 87 Pages


     (b) Whenever  Purchaser wishes to exercise the Option,  it shall deliver to
the Company a written notice (the  "Notice",  the date of receipt of which being
herein  referred to as the "Notice  Date")  specifying  (i) the total  number of
shares it intends to purchase  pursuant to such  exercise,  and (ii) a place and
date not earlier than two business days nor later than 60 calendar days from the
Notice Date for the closing of such purchase (a "Closing  Date");  provided that
if any closing of the  purchase  and sale  pursuant to the Option (a  "Closing")
cannot be consummated  by reason of any applicable  Law, the period of time that
otherwise  would run from the Notice Date  pursuant to this  sentence  shall run
instead from the date on which such  restriction on consummation  has expired or
been terminated;  and provided further that, without limiting the foregoing,  if
prior  notification to or approval of any Governmental  Authority is required in
connection with such purchase,  Purchaser and, if applicable,  the Company shall
promptly  file the  required  notice  or  application  for  approval  and  shall
expeditiously  process the same (and the Company shall  cooperate with Purchaser
in the filing of any such notice or  application  and the  obtaining of any such
approval),  and the period of time that otherwise would run from the Notice Date
pursuant to this sentence shall run instead from the date on which,  as the case
may be, (i) any required  notification  period has expired or been terminated or
(ii) such approval has been obtained, and in either event, any requisite waiting
period  has  passed.  If  such  notification  period  has  not  expired  or been
terminated or such approval has not been  obtained,  or such waiting  period has
not  passed,  in any case the effect of which is to prevent or delay the Closing
for 90 days beyond the Notice Date, then, upon written request made by Purchaser
within 14 days of the end of such 90 day period,  the Company  shall  redeem the
Option for a  redemption  price  equal to (x) the excess of the  Current  Market
Price of the Common  Stock as of the third  anniversary  of the date hereof over
the  Exercise  Price,  multiplied  by (y) the number of shares  specified in the
Notice.
 
     (c) In connection with any Closing,  the Company may request that Purchaser
represent that, as of the Closing Date applicable to such Closing, (i) Purchaser
is an  "accredited  investor"  within the meaning of Rule 501 of the  Securities
Act, and  (ii) Purchaser  is acquiring the Option Shares being purchased at such
Closing  for the  purpose  of  investment  and not with a view to or for sale in
connection with any  distribution  thereof.  If the Company makes such a request
and Purchaser  fails to make such  representations,  then (except as provided in
the  following  sentence)  the Company  shall have no  obligation to effect such
Closing. Purchaser may, in lieu of making the representation set forth in clause
(i), furnish the Company with an opinion of counsel reasonably acceptable to the
Company, to the effect that the acquisition of the Option Shares at such Closing
is exempt  from  registration  under the  Securities  Act and  applicable  state
securities laws.  Notwithstanding  the foregoing purchaser shall not be required
to make the  representation  set forth in  clause  (i) or  furnish  such a legal
opinion if purchaser is exercising the Option and immediately thereafter selling
the Option Shares pursuant to the Registration Rights Agreement.
 
     (d) Notwithstanding  the foregoing,  if, on any date subsequent to 180 days
from the date hereof,  the Current  Market Price of the Common Stock  exceeds $6
(each such date, a "Threshold Date"),  then the Company may require Purchaser to
either exercise or forfeit the Option as follows: (i) within 14 calendar days of
any  Threshold  Date,  the Company may deliver a written  notice (a "Notice") to
Purchaser specifying that it is exercising its right under this Section 3(d) and
specifying  the number of shares to be purchased  (which  number may be all or a
portion of the shares then subject to the Option), and (ii) Purchaser shall have
60 calendar days to respond to such Notice either electing to  (x) exercise  the
Option to the extent set forth in such  Notice or  (y) forfeit  the Option  (but
only in respect of the number of shares set forth in such Notice).  If Purchaser
fails to respond within such 60 calendar day period,  Purchaser  shall be deemed
to have  forfeited  the Option  (but only in respect of the number of shares set
forth in such Notice).


                                      - 2 -
<PAGE>

                                                             Page 55 of 87 Pages

4. Payment and Delivery of  Certificates.  (a) At each Closing,  Purchaser shall
pay to the Company the aggregate  Exercise Price for the Option Shares purchased
at such Closing pursuant to the exercise of the Option in immediately  available
funds by wire transfer to a bank account  designated not later than one business
day prior to the Closing Date for such Closing by the Company.

     (b) At such  Closing,  simultaneously  with the  delivery of the  aggregate
Exercise Price as provided in Section 4(a)  hereof, the Company shall deliver to
Purchaser a certificate or certificates representing the number of Option Shares
then being  purchased by  Purchaser,  registered  in the name of Purchaser or as
designated in writing by Purchaser,  which Option Shares shall be fully paid and
nonassessable and free and clear of all liens, claims,  charges and encumbrances
of any kind whatsoever.

     (c) If at the  time  of  issuance  of any  Option  Shares  pursuant  to any
exercise of the Option,  the Company shall have issued any share purchase rights
or similar  securities  ("Rights")  to holders of any class of the Common Stock,
then each such Option Share shall also represent Rights with terms substantially
the same as and at least as  favorable  to  Purchaser  as those  issued to other
holders of the Common Stock.

     (d) Certificates for Option Shares delivered at any Closing hereunder shall
be  endorsed  with a  restrictive  legend,  which  shall read  substantially  as
follows:

          "The  securities   represented  by  this  certificate  have  not  been
          registered  under the Securities Act of 1933 or the securities laws of
          any state and may not be sold or otherwise disposed of except pursuant
          to an effective  registration  statement under such act and applicable
          state  securities laws or an applicable  exemption to the registration
          requirements of such act or such laws."

It is  understood  and agreed that the above legend shall be removed by delivery
of substitute  certificate(s)  without such legend in connection with a transfer
or sale if (i) the  Company  has been  furnished  with an  opinion  of  counsel,
reasonably  satisfactory to counsel for the Company,  that such transfer or sale
will not violate the Securities Act or applicable  securities  laws of any state
or (ii) such transfer or sale shall have been registered and qualified  pursuant
to the Securities Act and any applicable state securities laws.

5. Representations and Warranties;  Covenants. (a) The Company hereby represents
and warrants to Purchaser that: (i) the Company has full corporate right,  power
and authority to execute and deliver this Second Option Agreement and to perform
all of its obligations hereunder; (ii) such execution,  delivery and performance
have been duly authorized by the Board of Directors of the Company, and no other
corporate proceedings are necessary therefor; (iii) this Second Option Agreement
has been duly and validly executed and delivered by the Company and represents a
valid and legally  binding  obligation of the Company,  enforceable  against the
Company  in  accordance  with its  terms;  and (iv) the  Company  has  taken all
necessary  corporate action to authorize and reserve and permit it to issue, and
at all times from the date hereof  through  the date of the  exercise in full or
the expiration or  termination  of the Option,  shall have reserved for issuance
upon  exercise  of the  Option,  1,000,000  shares of Common  Stock  (subject to
adjustment as provided  herein),  all of which, upon issuance in accordance with
the terms of this Second Option  Agreement,  shall be duly  authorized,  validly
issued,  fully paid and nonassessable,  shall be delivered free and clear of all
claims,  liens,  encumbrances  and  security  interests  and not  subject to any

                                       -3-
<PAGE>

                                                             Page 56 of 87 Pages

preemptive  rights of any  stockholder of the Company,  and will be eligible for
NASDAQ NMS trading without further consents or actions (other than  registration
thereof pursuant to the Registration Rights Agreement). Notwithstanding anything
contained  in the  Purchase  Agreement  to the  contrary,  the  representations,
warranties  and  covenants  contained in this Section 5 shall  survive for three
years from the date hereof.

     (b)  Purchaser  hereby  represents  and  warrants to the  Company  that (i)
Purchaser has full corporate  right,  power and authority to execute and deliver
this Second Option  Agreement and to perform all of its  obligations  hereunder;
(ii) such execution,  delivery and performance  have been duly authorized by all
requisite corporate action by Purchaser,  and no other corporate proceedings are
necessary therefor; (iii) this Second Option Agreement has been duly and validly
executed and delivered by Purchaser and  represents a valid and legally  binding
obligation of Purchaser,  enforceable  against  Purchaser in accordance with its
terms;  and (iv) any Common  Stock  acquired by Purchaser  upon  exercise of the
Option will not be  transferred  or otherwise  disposed of for 180 days from the
date hereof and then only in compliance with the Securities Act.

6. Adjustment upon Changes in Capitalization.  (a) In the event of any change in
the Common Stock by reason of stock dividends,  stock splits,  recapitalizations
or the like,  the type and  number  of  shares  subject  to the  Option  and the
Exercise Price shall be adjusted appropriately.

     (b) If at any time  following  the date  hereof,  the  Company  shall issue
shares of Common Stock (or rights, warrants or other securities convertible into
or  exchangeable   for  shares  of  Common  Stock   (collectively   "Convertible
Securities")) at a price per share (or having a conversion price per share) less
than the Current Market Price (as defined below) per share of Common Stock as of
the date of issuance of such shares (or, in the case of Convertible  Securities,
less than the Current Market Price as of the date of issuance of the Convertible
Securities  in respect of which  shares of Common Stock were  issued),  then the
Exercise Price shall be adjusted by multiplying (A) the Exercise Price in effect
on the day immediately  prior to such date by (B) a  fraction,  the numerator of
which shall be the sum of (1) the  number of shares of Common Stock  outstanding
on such date and (2) the  number of shares of Common  Stock  purchasable  at the
then Current Market Price per share with the aggregate consideration  receivable
by the Company for the total number of shares of Common Stock so issued (or into
which the  Convertible  Securities  may convert),  and the  denominator of which
shall be the sum of (x) the number of shares of Common Stock outstanding on such
date and (y) the  number of  additional  shares of Common  Stock issued (or into
which the Convertible Securities may convert).

     An adjustment  made pursuant to this Section 6(b) shall be made on the next
business day  following the date on which any such issuance is made and shall be
effective  retroactively  to the close of business on the date of such issuance.
For purposes of this Section 6(b), the aggregate consideration receivable by the
Company  in  connection  with the  issuance  of  shares  of  Common  Stock or of
Convertible  Securities  shall be deemed to be equal to the sum of the aggregate
offering price (before  deduction of  underwriting  discounts or commissions and
expenses  payable to third  parties)  of all such Common  Stock and  Convertible
Securities plus the minimum  aggregate  amount, if any, payable upon exercise or
conversion of any such Convertible Securities. The issuance or reissuance of any
shares of Common Stock (whether treasury shares or newly issued shares) pursuant
to  (i)  a  dividend  or  distribution   on,  or  subdivision,   combination  or
reclassification  of,  the  outstanding  shares of  Common  Stock  requiring  an
adjustment  in the Exercise  Price  pursuant to Section  6(a), or (ii) any stock
option plan,  stock  purchase  plan or other  benefit  program of the Company or
executive  compensation  package  approved by the  Company's  Board of Directors
involving  the grant of options to employees  or directors of the Company  shall
not be  deemed  to  constitute  an  issuance  of  Common  Stock  or  Convertible

                                      -4-
<PAGE>

                                                             Page 57 of 87 Pages


Securities  by  the  Company  to  which  this  Section 6(b)  applies.  Upon  the
expiration unexercised of any Convertible Securities for which an adjustment has
been made pursuant to this  Section 6(b),  the  adjustments  shall  forthwith be
reversed to effect such rate of  conversion  as would have been in effect at the
time of such expiration or termination had such Convertible  Securities,  to the
extent  outstanding  immediately prior to such expiration or termination,  never
been issued.

     "Current  Market  Price",  when used with reference to shares of the Common
Stock or  another  security  on any date,  shall  mean the  average of the daily
closing  prices  per share of such  Common  Stock or other  security  for the 20
preceding  trading days. If the Common Stock or such other securities are listed
or  admitted to trading on a national  securities  exchange,  the closing  price
shall be the last sale price,  regular way, or, in case no such sale takes place
on such day,  the average of the closing bid and asked  prices,  regular way, in
either case as  reported in the  principal  consolidated  transaction  reporting
system with respect to securities  listed or admitted to trading on the New York
Stock  Exchange or, if the Common Stock or such other  securities are not listed
or  admitted  to trading  on the New York Stock  Exchange,  as  reported  in the
principal  consolidated  transaction reporting system with respect to securities
listed on the principal national  securities  exchange on which the Common Stock
or such other  securities  are listed or  admitted  to trading or, if the Common
Stock or such  other  securities  are not so listed on any  national  securities
exchange,  as  reported  in  the  transaction  reporting  system  applicable  to
securities  designated as a "national market system security" or NASDAQ.  If the
Common  Stock or such other  securities  are not  publicly  held or so listed or
designated,  "Current Market Price" shall mean the Fair Market Value (as defined
below) per share of Common Stock or of such other  securities  as  determined in
good faith by the Board of  Directors  of the Company  based on an opinion of an
independent investment banking firm with an established national reputation with
respect to the valuation of securities.

     "Fair Market  Value" shall mean,  as to shares of Common Stock or any other
securities  of the Company or any other issuer which are  publicly  traded,  the
Current Market Prices of such shares or  securities.  The "Fair Market Value" of
any security  which is not publicly  traded or of any other  property shall mean
the fair value  thereof as determined by an  independent  investment  banking or
appraisal  firm  experienced  in the  valuation of such  securities  or property
selected in good faith by the Board of Directors of the Company.

     (c) In case the  Company  shall at any time or from time to time  after the
date  hereof  declare,  order,  pay or make a  dividend  or  other  distribution
(including, without limitation, any distribution of stock or other securities or
property or Convertible  Securities of the Company or any of its Subsidiaries by
way of dividend or spinoff),  on its Common Stock,  then, and in each such case,
the Exercise Price shall be adjusted by multiplying  (1) the applicable Exercise
Price  on  the  day  immediately   prior  to  the  record  date  fixed  for  the
determination of stockholders  entitled to receive such dividend or distribution
by (2) a  fraction,  the numerator of which shall be the Current Market Price of
the Common  Stock less the Fair Market  Value of such  dividend or  distribution
(per share of Common Stock),  and the denominator of which shall be such average
Current  Market Price of the Common Stock.  If any dividend or  distribution  is
declared  or  ordered  and a Closing  Date is before  the  record  date for such
dividend or distribution, then no adjustment in respect thereof shall be made to
the Exercise  Price with respect to the Option  Shares  acquired on such Closing
Date.

     (d) For purposes of this Section 6, the number of shares of Common Stock at
any time outstanding  shall not include any shares of Common Stock then owned or
held by or for the account of the Company.

                                      - 5 -
<PAGE>

                                                             Page 58 of 87 Pages


     (e) The term  "dividend," as used in this Section 6,  shall mean a dividend
or other distribution in respect of shares of Common Stock of the Company.

     (f) Anything in this Section 6 to the contrary notwithstanding, the Company
shall not be required to give effect to any  adjustment  in the  Exercise  Price
unless and until the net effect of one or more adjustments  (each of which shall
be carried  forward),  determined  as above  provided,  shall have resulted in a
change of the Exercise  Price by at least one percent,  and when the  cumulative
net  effect of more than one  adjustment  so  determined  shall be to change the
Exercise  Price by at least one  percent,  such change in  Exercise  Price shall
thereupon be given effect.

     (g) The  certificate  of any  firm of  independent  public  accountants  of
recognized  national  standing selected by the Board of Directors of the Company
(which may be the firm of independent public  accountants  regularly employed by
the Company) shall be presumptively  correct for any computation made under this
Section 6.

7. Registration Rights.  Contemporaneously  herewith,  Purchaser and the Company
are entering into a Registration  Rights Agreement providing for registration of
the Option Shares.

8.  Listing.  If the Common Stock or any other  securities  to be acquired  upon
exercise of the Option are then listed on any national securities exchange,  the
Company,  upon the request of Purchaser,  will promptly file an  application  to
list the Option  Shares or other  securities to be acquired upon exercise of the
Option on all such exchanges and will use its best efforts to obtain approval of
such listings as soon as practicable.

9. Survival.  The representations,  warranties,  covenants and agreements of the
parties hereto shall survive any Closing.

10. Severability. Any term, provision, covenant or restriction contained in this
Second  Option  Agreement  held by a court or other  Governmental  Authority  of
competent jurisdiction to be invalid, void or unenforceable shall be ineffective
to the extent of such invalidity, voidness or unenforceability,  but neither the
remaining terms, provisions,  covenants or restrictions contained in this Second
Option  Agreement  nor the  validity  or  enforceability  thereof  in any  other
jurisdiction  shall be  affected  or  impaired  thereby.  Any  term,  provision,
covenant or  restriction  contained in this Second Option  Agreement  that is so
found to be so broad as to be unenforceable  shall be interpreted to be as broad
as is enforceable.

11. Entire Agreement.  This Second Option Agreement, the First Option Agreement,
the Purchase Agreement  (including the documents and the instruments referred to
therein or  delivered  in  connection  therewith)  and the  Registration  Rights
Agreement  constitute the entire agreement between the parties and supersede all
prior agreements and understandings, agreements or representations by or between
the parties,  written and oral,  with respect to the subject  matter  hereof and
thereof.

12. Successors;  No Third Party Beneficiaries.  The terms and conditions of this
Second  Option  Agreement  shall inure to the benefit of and be binding upon the
parties  hereto and their  respective  successors  and assigns.  Nothing in this
Second Option  Agreement,  expressed or implied,  is intended to confer upon any
party,  other than the  parties  hereto,  and their  respective  successors  and
assigns, any rights, remedies, obligations, or liabilities under or by reason of
this Second Option Agreement, except as expressly provided herein.


                                      - 6 -
<PAGE>
                                                             Page 59 of 87 Pages


13. Notices. All notices or other communications which are required or permitted
hereunder  shall be in writing and  sufficient if delivered in  accordance  with
Section  8.5  of  the  Purchase  Agreement  (which  is  incorporated  herein  by
reference).

14. Further Assurances. In the event of any exercise of the Option by Purchaser,
the Company and  Purchaser  shall  execute and deliver all other  documents  and
instruments and take all other action that may be reasonably  necessary in order
to consummate the transactions provided for by such exercise.

15.  Specific  Performance.  The  parties  hereto  agree  that if for any reason
Purchaser or the Company shall have failed to perform its obligations under this
Second Option Agreement, then either party hereto seeking to enforce this Second
Option Agreement against such non-performing party shall be entitled to specific
performance  and injunctive and other equitable  relief,  and the parties hereto
further agree to waive any  requirement  for the securing or posting of any bond
in  connection  with the  obtaining of any such  injunctive  or other  equitable
relief.  This  provision  is without  prejudice  to any other rights that either
party  hereto may have against the other party hereto for any failure to perform
its obligations under this Second Option Agreement.

16. Governing Law. This Second Option Agreement shall be governed by the laws of
the State of Delaware,  without giving effect to the conflict of laws principles
thereof. Each party hereby irrevocably and unconditionally consents to submit to
the  exclusive  jurisdiction  of the courts of the State of Delaware  and of the
United States of America  located in  Wilmington,  Delaware,  for any Litigation
(and agrees not to commence any Litigation except in any such court). Each party
hereby  irrevocably  and  unconditionally  waives any objection to the laying of
venue of any  Action in the  courts of the State of  Delaware  or of the  United
States  of  America  located  in  Wilmington,   Delaware,   and  hereby  further
irrevocably and  unconditionally  waives and agrees not to plead or claim in any
such  court that any  Action  brought  in any such court has been  brought in an
inconvenient forum.

17. Regulatory Approvals;  Section 16(b). If, in connection with the exercise of
the  Option  under  Section  3,  prior   notification  to  or  approval  of  any
Governmental Authority is required,  then the required notice or application for
approval shall be promptly filed and/or  expeditiously  processed by the Company
and periods of time that otherwise  would run pursuant hereto (if any) shall run
instead from the date on which any such required notification period has expired
or been terminated or such approval has been obtained,  and in either event, any
requisite waiting period shall have passed. Periods of time that otherwise would
run  pursuant  to this  Second  Option  Agreement  shall also be extended to the
extent necessary in order to avoid liability under Section 16(b) of the Exchange
Act.

18. Waiver and Amendment.  Any provision of this Second Option  Agreement may be
waived in writing at any time by the party that is entitled  to the  benefits of
such  provision.  This Second  Option  Agreement  may not be modified,  amended,
altered or  supplemented  except upon the  execution  and  delivery of a written
agreement executed by the parties hereto.

                                      -7-
<PAGE>

                                                             Page 60 of 87 Pages


     IN WITNESS  WHEREOF,  each of the parties  hereto has executed  this Second
Option Agreement as of the date first written above.


                                   PURCHASER:

                                   M & M NOMINEE L.L.C.

                                   By:/s/ Peter Streinger
                                      -----------------------------------
                                      Name:  Peter Streinger
                                      Title: Manager


                                   THE COMPANY:

                                   THE UNIMARK GROUP, INC.

                                   By:/s/ Rafael Vaquero Bazan
                                      ------------------------------------
                                      Name:  Rafael Vaquero Bazan
                                      Title: President, Chief Executive Officer
                                             and Chief Operating Officer


                                      -8-




                                                             Page 61 of 87 Pages


                                    EXHIBIT E



                          REGISTRATION RIGHTS AGREEMENT

          REGISTRATION  RIGHTS  AGREEMENT,  dated  as of  July  17,  1998  (this
"Agreement"),  by and between THE UNIMARK GROUP,  INC., a Texas corporation (the
"Company"),  and M & M Nominee L.L.C., a Delaware limited liability company (the
"Investor").



     1.  Background.  The Company and the Investor  have entered into a Purchase
Agreement,  dated as of the date hereof (the "Purchase Agreement").  In order to
induce the Investor to enter into and consummate the  transactions  contemplated
by the Purchase  Agreement,  the Company has agreed to provide the  registration
rights  set  forth  in  this  Agreement.  The  execution  and  delivery  of this
Registration  Rights  Agreement is a condition to the execution and delivery of,
and Closing under, the Purchase Agreement.



     2.  Definitions.  Capitalized  terms used but not defined herein shall have
the respective meanings given to them in the Purchase Agreement. As used herein,
unless the context  otherwise  requires,  the following terms have the following
respective meanings:



          "Option  Shares"  means the  shares of  Common  Stock or other  equity
securities  issued or issuable  upon  exercise of either the First Option or the
Second Option.

          "Incidental Registration" is defined in Section 3.2.



          "Participating  Holders" means the holders of  Registrable  Securities
participating in the particular registration.

 

          "Registration  Expenses" means all expenses  incident to the Company's
performance of or compliance with Section 3,  including, without limitation, all
registration,  filing and applicable fees of the  Commission,  stock exchange or
NASD  registration and filing fees and all listing fees and fees with respect to
the inclusion of securities in NASDAQ (as defined in  Section 3.3(j)),  all fees
and expenses of complying with state securities or blue sky laws (including fees
and disbursements of counsel to the underwriters or the Participating Holders in
connection  with "blue sky"  qualification  of the  Registrable  Securities  and

<PAGE>

                                                             Page 62 of 87 Pages


determination of their  eligibility for investment under the laws of the various
jurisdictions),  all word  processing,  duplicating and printing  expenses,  all
messenger and delivery  expenses,  the fees and disbursements of counsel for the
Company and of its  independent  public  accountants  including  the expenses of
"cold comfort"  letters required by or incident to such  registration,  all fees
and  disbursements  of  underwriters  customarily  paid by issuers or sellers of
securities,  all transfer taxes, and the fees and expenses of one counsel to the
Participating  Holders  (selected by the Requisite  Percentage of  Participating
Holders);  provided,  however,  that Registration Expenses shall exclude and the
Participating  Holders shall pay underwriters'  fees and underwriting  discounts
and commissions in respect of the Registrable Securities being registered.

 

          "Registrable Securities" means (i) any Primary Shares, (ii) any Option
Shares and (iii) any shares  purchased  from certain  executives  of the Company
pursuant to the  Shareholders  Agreement,  dated as of the date  hereof,  by and
among the Investor,  Rafael Vaquero Bazan and Fernando  Camacho Casas. As to any
particular Registrable Securities, such securities shall cease to be Registrable
Securities  (a) when a  registration  statement with respect to the sale of such
securities  shall  have  become  effective  under  the  Securities  Act and such
securities  shall have been  disposed of in  accordance  with such  registration
statement,  (b) when such securities shall have been otherwise transferred,  new
certificates  for them not bearing a legend  restricting  further transfer under
the  Securities  Act shall have been  delivered  by the Company  and  subsequent
public  distribution  of them shall not require  registration  of them under the
Securities  Act,  (c) when such  securities  are sold  pursuant  to Rule 144 (or
similar rule adopted by the  Commission)  under the Securities  Act, or (d) when
such securities cease to be outstanding.

 

          "Requested Registration" is defined in Section 3.1(a).

 

          "Requisite  Percentage  of  Outstanding  Holders"  mean the holders of
Registrable  Securities  who hold 33% or more of the  total  Option  Shares  and
Primary Shares (counted as a single group) that are then  outstanding  (assuming
that the then  exercisable  portion  of the First  Option  (if any) and the then
exercisable  portion of the Second Option (if any) had been exercised for Option
Shares).

 

          "Requisite  Percentage of Participating  Holders" means  Participating
Holders of Registrable Securities who hold a majority of the total Option Shares
and  Primary  Shares  (counted  as a single  group) that are then be held by all
Participating  Holders (assuming that the then exercisable  portion of the First
Option (if any) and the then  exercisable  portion of the Second Option (if any)
had been exercised for Option Shares).


                                      - 2 -
<PAGE>
                                                             Page 63 of 87 Pages


     3. Registration Under Securities Act, etc.

 

          3.1 Requested Registrations.

               (a) Request for Registration.  Subject to the limitations imposed
by Sections  3.1(c),  at any time and from time to time,  one or more holders of
Registrable  Securities  representing  the Requisite  Percentage of  Outstanding
Holders  shall have the right to  require  the  Company  to file a  registration
statement under the Securities Act covering all or any part of their  respective
Registrable Securities,  by delivering a written request therefor to the Company
specifying  the number and amount of  Registrable  Securities  and the  intended
method of distribution thereof. Any such request pursuant to this Section 3.1(a)
is  referred to herein as a  "Requested  Registration."  The Company  shall give
prompt  written notice of each  Requested  Registration  to all other holders of
record of Registrable  Securities,  and thereupon the Company shall use its best
efforts  to effect the  registration  under the  Securities  Act so as to permit
promptly the sale, in accordance  with the intended method of  distribution,  of
the Registrable  Securities  which the Company has been so requested to register
in the Requested  Registration  and all other  Registrable  Securities which the
Company has been requested to register by the holders thereof by written request
given to the Company  within 30 days after the giving of such written  notice by
the Company.



               (b) Registration of Other Securities.  Whenever the Company shall
effect  a  registration  pursuant  to this  Section  3.1 in  connection  with an
underwritten  offering  by one or  more  Participating  Holders  of  Registrable
Securities,  no securities other than  Registrable  Securities shall be included
among the  securities  covered by such  registration  unless  (i)  Participating
Holders  representing the Requisite  Percentage of  Participating  Holders shall
have consented in writing to the inclusion  therein of such other securities and
(ii) such inclusion shall be permitted only to the extent that it is pursuant to
and subject to the terms of the  underwriting  agreement or arrangements and the
inclusion  of such  securities  will not have a material  adverse  effect on the
offering (including, without limitation, on the pricing of the offering).



               (c) Limitations on Requested Registrations;  Expenses. The rights
of holders of Registrable Securities to request Requested Registrations pursuant
to Section  3.1(a) are  subject to the  following  limitations:  (i) the Company
shall not be  obligated to effect a Requested  Registration  having an aggregate
anticipated  offering  price of less than  U.S.$2,000,000  unless such  offering
shall  cover  all  remaining  Registrable  Securities;   (ii)  the  offering  of
Registrable  Securities  requested to be registered  pursuant to Section  3.1(a)
shall be pursuant to a firm commitment underwritten offering;  (iii) the Company
shall not be  obligated  to effect a  Requested  Registration  within six months
after the effective  date of any other  registration  of securities  (other than
pursuant to a registration on Form S-8 or any successor or similar form which is
then in effect); and (iv) the Company will pay all Registration Expenses only in
connection  with  the  first  three  Requested   Registrations   of  Registrable
Securities  pursuant to this  Section 3.1 that have become  effective  under the
Securities Act.

                                      - 3 -
<PAGE>
                                                             Page 64 of 87 Pages


               (d) Registration Statement Form. Registrations under this Section
3.1  shall  be on  Form  S-3  or any  successor  form,  if  permitted,  or  such
appropriate  registration  form of the  Commission  as shall be  selected by the
Company and as shall be reasonably  acceptable  to the  Requisite  Percentage of
Participating  Holders.  The Company agrees to include in any such  registration
statement all information  which, in the opinion of counsel to the Participating
Holders and counsel to the Company, is required to be included.



               (e) Effective  Registration  Statement.  A registration requested
pursuant  to  this  Section  3.1  shall  not be  deemed  to have  been  effected
(including  for  purposes of  paragraph  (c) of this  Section  3.1) (i) unless a
registration  statement with respect  thereto has become  effective and has been
kept  continuously  effective  for a period of at least 90 days (or such shorter
period which shall terminate when all the Registrable Securities covered by such
registration  statement have been sold pursuant thereto),  (ii) if, after it has
become  effective,  such  registration  is  interfered  with by any stop  order,
injunction or other order or requirement of the Commission or other Governmental
Authority or court for any reason not attributable to the Participating  Holders
and has not thereafter become  effective,  or (iii) if the conditions to closing
specified in the underwriting agreement, if any, entered into in connection with
such registration are not satisfied or waived, other than by reason of a failure
on the part of the Participating Holders.



               (f)  Selection  of  Underwriters.  The  managing  underwriter  or
underwriters of each underwritten  offering of the Registrable  Securities so to
be  registered  shall be selected by the Requisite  Percentage of  Participating
Holders (and shall be reasonably acceptable to the Company).



               (g)   Cutbacks  in  Requested   Registration.   If  the  managing
underwriter of any underwritten  offering shall advise the Participating Holders
in such offering that the  Registrable  Securities  covered by the  registration
statement cannot be sold in such offering within a price range acceptable to the
Requisite Percentage of Participating  Holders,  then the Participating  Holders
representing the Requisite  Percentage of  Participating  Holders shall have the
right to notify  the  Company  in  writing  that they have  determined  that the
registration  statement be abandoned  or  withdrawn,  in which event the Company
shall abandon or withdraw such registration statement (and, at the option of the
Requisite Percentage of Participating  Holders, the Participating  Holders shall
either  (i) reimburse  the Company for its expenses  incurred in connection with
such abandoned or withdrawn  registration statement or (ii) allow the Company to
count such  abandoned  or withdrawn  registration  statement as one of the three
Requested  Registrations under Section 3.1(c)(iv)).  If the managing underwriter
of any underwritten offering shall advise the Company in writing (with a copy to
each  Participating  Holder)  that,  in its  opinion,  the number of  securities
requested  to be included in such  registration  exceeds the number which can be
sold  in  such  offering  within  a  price  range  acceptable  to the  Requisite
Percentage  of  Participating   Holders,   the  Company  will  include  in  such
registration, to the extent of the number which the Company is so advised can be
sold in such offering,  Registrable  Securities requested to be included in such
registration,   pro  rata  among  the  Participating   Holders  requesting  such
registration  in accordance  with the number of Primary Shares and Option Shares

                                      -4-

<PAGE>

                                                             Page 65 of 87 Pages


held by (or  issuable  to) each such  Participating  Holder so  requested  to be
registered,  and any  securities  of the Company  included in such  registration
pursuant to Section 3.1(b) shall be reduced proportionately.



               (h)  Postponement.  The  Company  shall be  entitled  once in any
six-month period to postpone for a reasonable  period of time (but not exceeding
90 days) the filing of any  registration  statement  required to be prepared and
filed by it pursuant  to this  Section  3.1 if the  Company  determines,  in its
reasonable  judgment,  that such  registration and offering would interfere with
any  financing,  corporate  reorganization  or  other  material  transaction  or
development  involving the Company or any subsidiary or would require  premature
disclosure  thereof,  and promptly gives the holders of  Registrable  Securities
requesting  registration  thereof pursuant to this Section 3.1 written notice of
such determination,  containing a statement of the reasons for such postponement
and an approximation of the anticipated  delay. If the Company shall so postpone
the filing of a registration  statement,  the Participating Holders representing
the  Requisite  Percentage  of  Participating  Holders  shall  have the right to
withdraw the request for  registration  by giving  written notice to the Company
within 20 days after receipt of the notice of postponement  and, in the event of
such  withdrawal,  such  request  shall  not be  counted  toward  the  number of
Requested Registrations (including for purposes of paragraph (c) of this Section
3.1).

 

          3.2 Incidental Registration.



               (a)  Incidental  Registration.  If,  at  any  time,  the  Company
proposes or is required to register any of its equity  securities  or securities
convertible into or exchangeable for equity  securities under the Securities Act
(other than pursuant to registrations on such form or similar form(s) solely for
registration  of  securities  in  connection  with an employee  benefit  plan or
dividend  reinvestment  plan) (an "Incidental  Registration"),  the Company will
give prompt written notice to all holders of record of Registrable Securities of
its intention to so register its  securities  and of such holders'  rights under
this  Section  3.2.  Upon the  written  request  of any  holder  of  Registrable
Securities made within 20 days  following the receipt of any such written notice
(which  request  shall  specify the  maximum  number of  Registrable  Securities
intended  to  be  disposed  of  by  such  holder  and  the  intended  method  of
distribution  thereof),  the  Company  will use its best  efforts  to effect the
registration  under the Securities Act of all Registrable  Securities  which the
Company has been so requested to register by the holders  thereof  together with
any other securities the Company is obligated to register pursuant to incidental
registration  rights of other security  holders of the Company.  No registration
effected  under this Section 3.2 shall relieve the Company of its  obligation to
effect any Requested Registration under Section 3.1.



               (b)  Abandonment or Delay.  If, at any time after the Company has
giving  written  notice of its intention to register any securities and prior to
the effective date of the  registration  statement filed in connection with such

                                      -5-
<PAGE>

                                                             Page 66 of 87 Pages


registration,   the  Company  shall  determine  not  to  register  or  to  delay
registration of such securities,  the Company may, at its election, give written
notice of such  determination  and its reasons therefor to all holders of record
of  Registrable  Securities  and  (i)  in the  case  of a  determination  not to
register,  shall be  relieved of its  obligation  to  register  any  Registrable
Securities in connection with such  registration (but not from any obligation of
the Company to pay the Registration  Expenses in connection therewith) , without
prejudice,  however,  to the  rights of any  holder or  holders  of  Registrable
Securities  entitled to do so to request that such registration be effected as a
registration under Section 3.1, and (ii) in the case of a determination to delay
registering,  shall be permitted to delay registering any Registrable Securities
for the same period as the delay in registering such other securities.



               (c)  Holder's  Right to  Withdraw.  Each  holder  of  Registrable
Securities  shall have the right to withdraw  its request for  inclusion  of its
Registrable  Securities in any registration  statement  pursuant to this Section
3.2 at any time by  giving  written  notice to the  Company  of its  request  to
withdraw.



               (d)  Unlimited  Number of  Registrations;  Expenses.  There is no
limitation  on the  number of  Incidental  Registrations  which the  Company  is
obligated  to effect  pursuant to this  Section  3.2.  The Company  will pay all
Registration  Expenses  in  connection  with  any  registration  of  Registrable
Securities requested pursuant to this Section 3.2.



               (e)  Underwriters'  Cutback in Incidental  Registrations.  If the
managing  underwriter of any  underwritten  offering shall inform the Company by
letter of its belief that the number of Registrable  Securities  requested to be
included in such registration  would materially  adversely affect such offering,
then the  Company  will  include in such  registration,  first,  the  securities
proposed  by the  Company  to be sold  for  its own  account  and,  second,  the
Registrable Securities and all other securities of the Company to be included in
such  registration  to the extent of the number and type which the Company is so
advised can be sold in (or during the time of) such offering, pro rata among the
Participating  Holders and such other holders  requesting  such  registration in
accordance  with the number of Primary  Shares  and  Option  Shares  held by (or
issuable to) each  Participating  Holder and each such other holder so requested
to be registered.



               (f)  Plan  of  Distribution.  Any  participation  by  holders  of
Registrable  Securities in a registration  by the Company shall be in accordance
with the Company's plan of distribution.

                                      -6-

<PAGE>

                                                             Page 67 of 87 Pages


          3.3 Registration  Procedures.  If and whenever the Company is required
to use its best efforts to effect the registration of any Registrable Securities
under the Securities Act as provided in Sections 3.1 or 3.2 hereof,  the Company
will as expeditiously as possible:



               (a) prepare and file with the  Commission as soon as  practicable
          the requisite  registration statement to effect such registration (and
          shall include all financial  statements  required by the Commission to
          be filed  therewith) and thereafter use its best efforts to cause such
          registration  statement to become effective;  provided,  however, that
          before filing such registration  statement (including all exhibits) or
          any amendment or supplement  thereto or  comparable  statements  under
          securities  or blue sky laws of any  jurisdiction,  the Company  shall
          furnish such documents to the  Participating  Holders,  their counsel,
          and each  underwriter,  if any,  participating  in the offering of the
          Registrable  Securities  and  its  counsel;  and  provided,   further,
          however,  that the Company may  discontinue  any  registration  of its
          securities  which are not Registrable  Securities at any time prior to
          the effective date of the registration statement relating thereto;



               (b) notify each Participating Holder of the Commission's requests
          for  amending or  supplementing  the  registration  statement  and the
          prospectus,  and prepare and file with the Commission  such amendments
          and supplements to such registration statement and the prospectus used
          in connection  therewith as may be necessary to keep such registration
          statement   effective  and  to  comply  with  the  provisions  of  the
          Securities  Act with  respect to the  disposition  of all  Registrable
          Securities  covered by such registration  statement for such period as
          shall  be  required  for the  disposition  of all of such  Registrable
          Securities, provided, that such period need not exceed 90 days;



               (c) furnish,  without charge, to each  Participating  Holder such
          number of conformed copies of such registration  statement and of each
          such  amendment  and  supplement  thereto (in each case  including all
          exhibits),  such number of copies of the prospectus  contained in such
          registration  statement (including each preliminary prospectus and any
          summary  prospectus)  and any other  prospectus  filed  under Rule 424
          under the Securities Act, in conformity  with the  requirements of the
          Securities Act, and such other documents, as such Participating Holder
          may reasonably request;



               (d)  use  its  best  efforts  (i)  to  register  or  qualify  all
          Registrable   Securities   and  other   securities   covered  by  such
          registration  statement under such securities or blue sky laws of such
          States of the  United  States of  America  where an  exemption  is not
          available and as the Participating  Holders shall reasonably  request,
          (ii) to keep such  registration or qualification in effect for so long
          as such registration  statement  remains in effect,  and (iii) to take
          any other  action  which may be  reasonably  necessary or advisable to

                                      -7-
<PAGE>

                                                             Page 68 of 87 Pages


          enable such  Participating  Holders to consummate  the  disposition in
          such  jurisdictions of the securities to be sold by such Participating
          Holders,  except  that the Company  shall not for any such  purpose be
          required to qualify generally to do business as a foreign  corporation
          in any  jurisdiction  wherein it would not but for the requirements of
          this  subsection  (d) be obligated to be so qualified or to consent to
          general service of process in any such jurisdiction;



               (e) use its best  efforts  to cause  all  Registrable  Securities
          covered  by  such  registration  statement  to be  registered  with or
          approved  by such  other  federal  or  state or  foreign  governmental
          agencies or  authorities as may be necessary in the opinion of counsel
          to the Company and counsel to the Participating  Holders to consummate
          the disposition of such Registrable Securities;



               (f) furnish to each Participating Holder and each underwriter, if
          any,  participating in the offering of the securities  covered by such
          registration statement, a signed counterpart of



                    (i) an  opinion  of outside  counsel  (or inside  counsel if
               satisfactory to each underwriter) for the Company, and



                    (ii) a "comfort"  letter  signed by the  independent  public
               accountants who have certified the Company's financial statements
               included  or  incorporated  by  reference  in  such  registration
               statement,

               covering  substantially  the same  matters  with  respect to such
               registration statement (and the prospectus included therein) and,
               in the case of the accountants'  comfort letter,  with respect to
               events  subsequent to the date of such financial  statements,  as
               are  customarily  covered in opinions of issuer's  counsel and in
               accountants'  comfort  letters  delivered to the  underwriters in
               underwritten  public offerings of securities (and dated the dates
               such opinions and comfort letters are customarily  dated) and, in
               the case of the legal opinion,  such other legal matters, and, in
               the case of the accountants' comfort letter, such other financial
               matters, as the Requisite Percentage of Participating Holders, or
               the underwriters, may reasonably request;



               (g) promptly notify each  Participating  Holder and each managing
          underwriter,  if any,  participating in the offering of the securities
          covered  by such  registration  statement  (i) when such  registration
          statement,   any  pre-effective   amendment,  the  prospectus  or  any

                                      -8-
<PAGE>

                                                             Page 69 of 87 Pages


          prospectus  supplement related thereto or post- effective amendment to
          such registration  statement has been filed, and, with respect to such
          registration statement or any post-effective  amendment, when the same
          has  become  effective;  (ii) of any  request  by the  Commission  for
          amendments  or  supplements  to  such  registration  statement  or the
          prospectus related thereto or for additional information; (iii) of the
          issuance  by  the   Commission  of  any  stop  order   suspending  the
          effectiveness of such registration  statement or the initiation of any
          proceedings  for that  purpose;  (iv) of the receipt by the Company of
          any notification  with respect to the suspension of the  qualification
          of any of the Registrable  Securities for sale under the securities or
          blue sky laws of any  jurisdiction or the initiation of any proceeding
          for such purpose;  (v) at any time when a prospectus  relating thereto
          is required to be delivered  under the Securities  Act, upon discovery
          that,  or upon the  happening  of any event as a result of which,  the
          prospectus included in such registration statement, as then in effect,
          includes an untrue  statement of a material fact or omits to state any
          material fact  required to be stated  therein or necessary to make the
          statements  therein not misleading,  in the light of the circumstances
          under which they were made, and in the case of this clause (v), at the
          request of any Participating  Holder,  promptly prepare and furnish to
          it  and  each  managing  underwriter,  if  any,  participating  in the
          offering of the Registrable  Securities a reasonable  number of copies
          of a  supplement  to or an  amendment  of  such  prospectus  as may be
          necessary so that, as thereafter  delivered to the  purchasers of such
          securities, such prospectus shall not include an untrue statement of a
          material  fact or omit to state a material  fact required to be stated
          therein or necessary to make the statements  therein not misleading in
          the light of the circumstances under which they were made; and (vi) at
          any time  when  the  representations  and  warranties  of the  Company
          contemplated by Section 3.4(a) hereof cease to be true and correct;



               (h) otherwise comply with all applicable rules and regulations of
          the Commission, and make available to its security holders, as soon as
          reasonably  practicable,  an earnings statement covering the period of
          at least twelve months  beginning  with the first full calendar  month
          after  the  effective  date  of  such  registration  statement,  which
          earnings  statement  shall satisfy the  provisions of Section 11(a) of
          the Securities Act and Rule 158 promulgated  thereunder,  and promptly
          furnish to each such  Participating  Holder a copy of any amendment or
          supplement to such registration statement or prospectus;



               (i)  provide  and cause to be  maintained  a  transfer  agent and
          registrar   (which,  in  each  case,  may  be  the  Company)  for  all
          Registrable Securities covered by such registration statement from and
          after a date not later than the effective date of such registration;

                                      - 9 -

<PAGE>
                                                             Page 70 of 87 Pages


               (j) use its best  efforts  to cause  all  Registrable  Securities
          covered  by such  registration  statement  to be listed on a  national
          securities  exchange or to secure  designation of all such Registrable
          Securities  as a National  Association  of  Securities  Dealers,  Inc.
          Automated   Quotation  System   ("NASDAQ")   "national  market  system
          security"  within the meaning of Rule 11Aa2-1  of the  Commission,  in
          each case to the extent the shares of the  Company's  Common Stock are
          so listed or designated;



               (k) deliver promptly to counsel to the Participating  Holders and
          each  underwriter,  if  any,  participating  in  the  offering  of the
          Registrable  Securities,  copies  of all  correspondence  between  the
          Commission and the Company,  its counsel or auditors and all memoranda
          relating to discussions  with the Commission or its staff with respect
          to such registration statement;



               (1) make every reasonable  effort to obtain the withdrawal of any
          order suspending the effectiveness of the registration statement;



               (m) provide a CUSIP  number for all  Registrable  Securities,  no
          later than the effective date of the registration statement; and



               (n) make  available  its  employees  and  personnel and otherwise
          provide reasonable assistance to the underwriters (taking into account
          the  needs  of  the  Company's   businesses)  in  their  marketing  of
          Registrable Securities.



The  Company  may  require  each  Participating  Holder  as to  the  Registrable
Securities  of whom any  registration  is being  effected to furnish the Company
such  information  regarding such holder and the distribution of such securities
as the Company may from time to time reasonably request in writing.



          Each holder of Registrable  Securities agrees that upon receipt of any
notice from the Company of the  happening of any event of the kind  described in
subsection (g) (iii) or (v) of this Section 3.3, the  Participating  Holder will
forthwith  discontinue  such  holder's  disposition  of  Registrable  Securities
pursuant to the registration  statement relating to such Registrable  Securities
until,  in the case of subsection  (g)(iii) of this Section 3.3, such stop order
is removed or proceedings  therefor  terminated,  and, in the case of subsection
(g)(v)  of  this  Section  3.3,  such  holder's  receipt  of the  copies  of the
supplemented or amended  prospectus  contemplated  by subsection  (g)(v) of this
Section 3.3 and, if so directed by the Company,  will deliver to the Company (at
the Company's  expense) all copies,  other than permanent  file copies,  then in

                                      -10-
<PAGE>

                                                             Page 71 of 87 Pages


such  holder's  possession,  of the  prospectus  relating  to  such  Registrable
Securities current at the time of receipt of such notice.

 

          3.4 Underwritten Offerings.



               (a)  Requested  Underwritten   Offerings.  If  requested  by  the
underwriters for any underwritten  offering by Participating Holders pursuant to
a  registration  requested  under  Section  3.1,  the Company  will use its best
efforts to enter into an underwriting  agreement with such underwriters for such
offering,  such agreement to be reasonably satisfactory in substance and form to
the  Company,  each  such  holder  and  the  underwriters  and to  contain  such
representations  and  warranties  by the  Company  and such  other  terms as are
generally prevailing in agreements of that type, including,  without limitation,
indemnities to the effect and to the extent provided in Section 3.6 hereof.  The
Participating  Holders will cooperate with the Company in the negotiation of the
underwriting agreement and will give consideration to the reasonable suggestions
of the Company regarding the form thereof.  The  Participating  Holders shall be
parties to such  underwriting  agreement and may, at their option,  require that
any or all of the representations and warranties by, and the other agreements on
the part of, the Company to and for the benefit of such underwriters  shall also
be made to and for the benefit of the Participating  Holders and that any or all
of the conditions  precedent to the obligations of such underwriters  under such
underwriting  agreement  be  conditions  precedent  to  the  obligations  of the
Participating  Holders.  No  Participating  Holder shall be required to make any
representations  or  warranties  to  or  agreements  with  the  Company  or  the
underwriters other than representations, warranties or agreements regarding such
holder, such holder's ownership of and title to the Registrable Securities, such
holder's intended method of distribution and any other representations  required
by law, and any  liability of the  Participating  Holder to any  underwriter  or
other person  under such  underwriting  agreement  shall be limited to liability
arising  from  misstatements  in  or  omissions  from  its  representations  and
warranties  and shall be limited to an amount equal to the net proceeds that the
Participating Holder derives from such registration.



               (b) Incidental Underwritten Offerings. If the Company proposes to
register any of its  securities  under the  Securities  Act as  contemplated  by
Section 3.2 hereof and such  securities  are to be distributed by or through one
or more  underwriters,  the Company  will,  if  requested  by any  Participating
Holder, use its best efforts to arrange for such underwriters to include all the
Registrable Securities to be offered and sold by such Participating Holder among
the  securities  of the  Company to be  distributed  by such  underwriters.  The
Participating Holders shall be parties to the underwriting agreement between the
Company and such underwriters and may, at their option,  require that any or all
of the  representations  and warranties by, and the other agreements on the part
of, the Company to and for the benefit of such  underwriters  shall also be made
to and for the benefit of such Participating  Holders and that any or all of the
conditions  precedent  to  the  obligations  of  such  underwriters  under  such
underwriting  agreement  be  conditions  precedent  to the  obligations  of such
Participating  Holders.  No  Participating  Holder shall be required to make any
representations  or  warranties  to  or  agreements  with  the  Company  or  the
underwriters other than representations, warranties or agreements regarding such

                                      -11-
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                                                             Page 72 of 87 Pages


holder, such holder's ownership of and title to the Registrable Securities, such
holder's intended method of distribution and any other representations  required
by law, and any  liability of the  Participating  Holder to any  underwriter  or
other person  under such  underwriting  agreement  shall be limited to liability
arising  from  misstatements  in  or  omissions  from  its  representations  and
warranties  and shall be limited to an amount equal to the net proceeds that the
Participating Holder derives from such registration.

 

          3.5  Preparation;  Reasonable  Investigation.  In connection  with the
preparation and filing of each  registration  statement under the Securities Act
pursuant to this  Agreement,  the Company will give the  Participating  Holders,
their  underwriters,  if any, and their  respective  counsel and accountants the
opportunity to participate in the  preparation of such  registration  statement,
each  prospectus  included  therein or filed with the  Commission,  and,  to the
extent practicable,  each amendment thereof or supplement thereto, and give each
of them such access to its books and records and such  opportunities  to discuss
the business of the Company with its officers and employees and the  independent
public  accountants  who have  certified  its  financial  statements as shall be
necessary,  in the opinion of such  holders' and such  underwriters'  respective
counsel,  to  conduct a  reasonable  investigation  within  the  meaning  of the
Securities Act.

 

          3.6 Indemnification.



               (a)   Indemnification  by  the  Company.  In  the  event  of  any
registration  of any  securities  of the Company under the  Securities  Act, the
Company  will,  and hereby does,  indemnify  and hold  harmless,  to the fullest
extent permitting by law, each Participating  Holder,  its directors,  officers,
partners,  agents  and  affiliates  or general  and  limited  partners  (and the
directors,  officers, employees,  stockholders and affiliates thereof), and each
other Person who  participates as an underwriter in the offering or sale of such
securities and each other Person, if any, who controls such Participating Holder
or any such  underwriter  within the meaning of the Securities Act,  against any
losses,  claims,  damages,  or  liabilities,  joint or  several  (or  actions or
proceedings, whether commenced or threatened) to which such Participating Holder
or any such  director,  officer,  partner,  agent or affiliate or underwriter or
controlling  person may become  subject under the  Securities  Act or otherwise,
insofar as such losses,  claims,  damages or  liabilities,  joint or several (or
actions or proceedings,  whether  commenced or threatened,  in respect  thereof)
arise out of or are based upon any untrue  statement or alleged untrue statement
of any material fact contained in any  registration  statement  under which such
securities were registered under the Securities Act, any preliminary prospectus,
final prospectus or summary prospectus  contained  therein,  or any amendment or
supplement  thereto,  together  with the  documents  incorporated  by  reference
therein,  or any omission or alleged  omission to state  therein a material fact
required to be stated  therein or  necessary to make the  statements  therein in
light of the  circumstances  in which  they  were made not  misleading,  and the
Company  will  reimburse  such  Participating  Holder  and each  such  director,
officer, partner, agent or affiliate, or general or limited partner, underwriter
and controlling Person for any legal or any other expenses  reasonably  incurred
by them in connection  with  investigating  or defending  any such loss,  claim,

                                      -12-
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                                                             Page 73 of 87 Pages


liability, action or proceeding;  provided, that the Company shall not be liable
in any such case to the extent that any such loss, claim, damage,  liability (or
action or  proceeding in respect  thereof) or expense  arises out of or is based
upon an untrue  statement  or alleged  untrue  statement  or omission or alleged
omission made in such registration  statement,  any such preliminary prospectus,
final prospectus,  summary prospectus,  amendment or supplement in reliance upon
and in conformity with written  information  furnished to the Company through an
instrument  duly  executed  by or on  behalf  of such  Participating  Holder  or
underwriter,  as the case may be, specifically stating that it is for use in the
preparation thereof; and provided, further, that the Company shall not be liable
to any Person who  participates  as an  underwriter  in the  offering or sale of
Registrable   Securities  or  any  other  Person,  if  any,  who  controls  such
underwriter  within the meaning of the  Securities  Act, in any such case to the
extent that any such loss, claim, damage,  liability (or action or proceeding in
respect  thereof) or expense arises out of such Person's failure to send or give
a copy of the final prospectus, as the same may be then supplemented or amended,
to the Person  asserting  an untrue  statement  or alleged  untrue  statement or
omission or alleged omission at or prior to the written confirmation of the sale
of  Registrable  Securities  to such Person if such  statement  or omission  was
corrected in such final  prospectus.  Such indemnity  shall remain in full force
regardless  of any  investigation  made by or on  behalf  of such  Participating
Holder or any such director, officer, partner, agent or affiliate or controlling
Person and shall survive the transfer of such  securities by such  Participating
Holder.



               (b) Indemnification by the Participating  Holders. As a condition
to including any  Registrable  Securities  in any  registration  statement,  the
Company  shall  have  received  an  undertaking  satisfactory  to  it  from  the
Participating  Holders to indemnify and hold harmless (in the same manner and to
the same extent as set forth in subsection (a) of this Section 3.6) the Company,
each  director and officer of the Company,  and each other  Person,  if any, who
controls the Company within the meaning of the  Securities  Act, with respect to
any statement or alleged  statement in or omission or alleged omission from such
registration statement, any preliminary prospectus,  final prospectus or summary
prospectus  contained therein, or any amendment or supplement thereto,  but only
if such statement or alleged  statement or omission or alleged omission was made
in reliance upon and in  conformity  with written  information  furnished to the
Company  through  an  instrument  duly  executed  by such  Participating  Holder
specifically  stating that it is for use in the preparation of such registration
statement,   preliminary  prospectus,  final  prospectus,   summary  prospectus,
amendment  or  supplement;   provided,  however,  that  the  liability  of  such
indemnifying  party under this Section  3.6(b) shall be limited to the amount of
net proceeds received by such indemnifying  party in the offering giving rise to
such liability. Such indemnity shall remain in full force and effect, regardless
of any  investigation  made by or on behalf of the Company or any such director,
officer or controlling  person and shall survive the transfer of such securities
by the Participating Holder.



               (c)  Notices  of  Claims,  etc.  Promptly  after  receipt  by  an
indemnified  party of notice of the  commencement  of any  action or  proceeding
involving a claim referred to in the preceding  subsections of this Section 3.6,
such indemnified party will, if a claim in respect thereof is to be made against
an indemnifying  party, give written notice to the latter of the commencement of
such  action  or  proceeding;   provided,  however,  that  the  failure  of  any
indemnified  party to give  notice as  provided  herein  shall not  relieve  the

                                      -13-
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                                                             Page 74 of 87 Pages


indemnifying  party of its obligations  under the preceding  subsections of this
Section  3.6,  except to the extent that the  indemnifying  party is  materially
prejudiced  by  such  failure  to  give  notice,   and  shall  not  relieve  the
indemnifying party from any liability which it may have to the indemnified party
otherwise  than under this Section 3.6. In case any such action or proceeding is
brought against an indemnified  party, the indemnifying  party shall be entitled
to  participate  therein  and,  unless in the opinion of outside  counsel to the
indemnified   party  a  conflict  of  interest   between  such  indemnified  and
indemnifying  parties may exist in respect of such claim,  to assume the defense
thereof,  jointly with any other  indemnifying  party similarly  notified to the
extent  that  it  may  wish,  with  counsel  reasonably   satisfactory  to  such
indemnified party; provided,  however, that if the defendants in any such action
or proceeding  include both the indemnified party and the indemnifying party and
if in the opinion of outside counsel to the indemnified party there may be legal
defenses  available to such indemnified party and/or other  indemnified  parties
which are different from or in addition to those  available to the  indemnifying
party, the indemnified  party or parties shall have the right to select separate
counsel to defend such action or proceeding on behalf of such indemnified  party
or parties, provided, further, that the indemnifying party shall be obligated to
pay for only one  counsel for all  indemnified  parties.  After  notice from the
indemnifying  party to such  indemnified  party of its election so to assume the
defense  thereof and  approval by the  indemnified  party of such  counsel,  the
indemnifying  party shall not be liable to such indemnified  party for any legal
expenses  subsequently  incurred  by the latter in  connection  with the defense
thereof other than reasonable costs of  investigation  (unless the first proviso
in the preceding  sentence shall be applicable).  No indemnifying party shall be
liable for any  settlement  of any action or  proceeding  effected  without  its
written  consent.  No  indemnifying  party  shall,  without  the  consent of the
indemnified party, consent to entry of any judgment or enter into any settlement
which  does not  include  as an  unconditional  term  thereof  the giving by the
claimant or plaintiff to such indemnified  party of a release from all liability
in respect to such claim or litigation.



               (d)  Contribution.  If the  indemnification  provided for in this
Section  3.6 shall for any  reason  be held by a court to be  unavailable  to an
indemnified  party  under  subsection  (a) or (b) hereof in respect of any loss,
claim, damage or liability,  or any action in respect thereof,  then, in lieu of
the amount paid or payable under  subsection (a) or (b) hereof,  the indemnified
party and the  indemnifying  party  under  subsection  (a) or (b)  hereof  shall
contribute to the aggregate losses,  claims,  damages and liabilities (including
legal or other expenses reasonably incurred in connection with investigating the
same), (i) in such proportion as is appropriate to reflect the relative fault of
the Company and the  Participating  Holders which resulted in such loss,  claim,
damage  or  liability,  or  action  in  respect  thereof,  with  respect  to the
statements or omissions which resulted in such loss, claim, damage or liability,
or  action  in  respect  thereof,  as  well  as  any  other  relevant  equitable
considerations  or (ii) if the  allocation  provided  by clause (i) above is not
permitted by  applicable  law, in such  proportion  as shall be  appropriate  to
reflect not only the relative fault but also the relative  benefits  received by
the Company and the  Participating  Holders from the offering of the  securities
covered by such registration  statement as well as any other relevant  equitable
considerations. The parties hereto agree that it would not be just and equitable
if  contributions  pursuant to this Section  3.6(d) were to be determined by pro
rata allocation or by any other method of allocation which does not take account
of  the  equitable  considerations  referred  to  above.  No  Person  guilty  of
fraudulent  misrepresentation  (within  the  meaning  of  Section  11(f)  of the
Securities  Act) shall be entitled to  contribution  from any Person who was not

                                      -14-
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                                                             Page 75 of 87 Pages


guilty  of  such  fraudulent   misrepresentation.   The  Participating  Holders'
obligations to contribute as provided in this subsection (d) are several and not
joint in  proportion  to the  relative  value of  their  respective  Registrable
Securities covered by such registration  statement. In addition, no Person shall
be obligated to contribute  hereunder any amounts in payment for any  settlement
of any action or claim  effected  without such Person's  consent,  which consent
shall not be unreasonably withheld.  Notwithstanding anything in this subsection
(d) to the contrary,  no  indemnifying  party (other than the Company)  shall be
required to contribute any amount in excess of the net proceeds received by such
party from the sale of the  Registrable  Securities in the offering to which the
losses, claims, damages or liabilities of the indemnified parties relate.



               (e)  Other  Indemnification.   Indemnification  and  contribution
similar to that specified in the preceding subsections of this Section 3.6 (with
appropriate  modifications) shall be given by the Company and each Participating
Holder with  respect to any  required  registration  or other  qualification  of
securities  under any  federal or state law or  regulation  of any  governmental
authority  other  than  the  Securities  Act.  The  indemnification   agreements
contained  in this  Section  3.6 shall be in  addition  to any  other  rights to
indemnification or contribution which any indemnified party may have pursuant to
law or  contract  and  shall  remain  operative  and in full  force  and  effect
regardless of any  investigation  made by or on behalf of any indemnified  party
and shall  survive the transfer of any of the  Registrable  Securities by any of
the Participating Holders.



               (f)   Indemnification    Payments.    The   indemnification   and
contribution  required by this Section 3.6 shall be made by periodic payments of
the amount thereof  during the course of the  investigation  or defense,  as and
when bills are received or expense, loss, damage or liability is incurred.

 

          3.7  Certain  Rights  of  the  Investor  If  Named  in a  Registration
Statement.  If any statement  contained in a  registration  statement  under the
Securities  Act  or in  any  filing  under  the  state  securities  laws  of any
jurisdiction  refers to the  Investor by name or  otherwise as the holder of any
securities of the Company, then the Investor shall have the right to require (i)
the insertion  therein of language,  in form and substance  satisfactory  to the
Investor, to the effect that the holding by the Investor of such securities does
not necessarily  make the Investor a "controlling  person" of the Company within
the meaning of the Securities Act and is not to be construed as a recommendation
by the  Investor  of the  investment  quality  of the  Company's  debt or equity
securities  covered  thereby  and that  such  holding  does not  imply  that the
Investor will assist in meeting any future financial requirements of the Company
or (ii) in the event that such reference to the Investor by name or otherwise is
not,  in the  reasonable  judgment of the  Investor  as advised by its  counsel,
required by the Securities Act or any of the rules and  regulations  promulgated
thereunder,  or any state securities laws of any  jurisdiction,  the deletion of
the reference to such Investor.

                                     - 15 -
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                                                             Page 76 of 87 Pages


          3.8 Unlegended  Certificates.  In connection  with the offering of any
Registrable  Securities registered pursuant to this Article 3, the Company shall
(i) facilitate the timely preparation and delivery to Participating  Holders and
the  underwriters,  if  any,  participating  in  such  offering,  of  unlegended
certificates representing ownership of such Registrable Securities being sold in
such   denominations   and  registered  in  such  names  as  requested  by  such
Participating  Holders or such underwriters and (ii) instruct any transfer agent
and registrar of such Registrable Securities to release any stop transfer orders
with respect to any such Registrable Securities.

 

          3.9  Limitation  on Sale or  Distribution  of  Other  Securities.  The
Company hereby agrees that, if it shall  previously  have received a request for
registration  pursuant  to  Section  3.1 or 3.2  hereof,  and if  such  previous
registration  shall not have been withdrawn or abandoned,  (i) the Company shall
not  effect  any  public or private  offer,  sale or other  distribution  of its
securities or effect any registration of any of its equity  securities under the
Securities  Act (subject to the  provisions of Section 3.2 hereof) (other than a
registration  on Form S-8 or any  successor  or  similar  form  which is then in
effect),  whether or not for sale for its own account, until a period of 90 days
(or such shorter period as the Requisite Majority of Participating Holders shall
agree) shall have elapsed from the effective date of such previous  registration
(and  the  Company  shall  so  provide  in any  registration  rights  agreements
hereafter  entered  into with  respect to any of its  securities);  and (ii) the
Company shall use its best efforts to cause each holder of its equity securities
purchased  from the Company at any time after the date of this  Agreement  other
than in a public offering to agree not to effect any public sale or distribution
of any such securities during such period, including a sale pursuant to Rule 144
under the Securities Act.

 

          3.10 No Required Sale.  Nothing in this  Agreement  shall be deemed to
create an independent obligation on the part of any Participating Holder to sell
any Registrable Securities pursuant to any effective registration statement.

 

     4. Rule 144.  The Company  shall take all actions  reasonably  necessary to
enable  holders  of  Registrable  Securities  to sell  such  securities  without
registration  under the  Securities  Act within the limitation of the exemptions
provided  by (a) Rule 144,  or  (b) any  similar  rule or  regulation  hereafter
adopted by the  Commission  including,  without  limiting the  generality of the
foregoing,  filing on a timely  basis all  reports  required  to be filed by the
Exchange  Act.  Upon the request of any holder of  Registrable  Securities,  the
Company  will  deliver to such holder a written  statement  as to whether it has
complied with such requirements.

 

     5.  Amendments and Waivers.  This Agreement may be amended with the consent
of (i) the  Company  and (ii) the  holders  of at least  51% of the  outstanding
Primary Shares and Option  Shares,  as a group  (assuming  that the  exercisable
portion (if any) of the First Option and the exercisable portion (if any) of the
Second Option are converted  into Option Shares but excluding any Primary Shares

                                      -16-
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                                                             Page 77 of 87 Pages


or Option Shares that are no longer  Registerable  Securities).  The Company may
take any action herein prohibited, or omit to perform any act herein required to
be  performed  by it, in each case only if the Company  shall have  obtained the
written consent to such action or omission to act, of holders of at least 51% of
the outstanding  Primary Shares and Option Shares, as a group (assuming that the
exercisable portion (if any) of the First Option and the exercisable portion (if
any) of the Second  Option are  converted  into Option  Shares but excluding any
Primary  Shares or Option  Shares that are no longer  Registerable  Securities).
Each holder of any Registrable  Securities at the time or thereafter outstanding
shall be bound by any consent  authorized by this Section 5, whether or not such
Registrable Securities shall have been marked to indicate such consent.

 

     6.  Nominees  for  Beneficial  Owners.  In the event  that any  Registrable
Securities  are  held  by a  nominee  for  the  beneficial  owner  thereof,  the
beneficial  owner  thereof  may,  at its  election in writing  delivered  to the
Company  (accompanied  by a written  acknowledgment  of, and  consent  to,  such
election  by such  nominee),  be  treated  as the  holder  of  such  Registrable
Securities  for purposes of any request or other action by any holder or holders
of Registrable Securities pursuant to this Agreement or any determination of any
number or percentage of shares of Registrable  Securities  held by any holder or
holders  of  Registrable  Securities  contemplated  by  this  Agreement.  If the
beneficial  owner of any  Registrable  Securities so elects to be treated as the
holder of such  Registrable  Securities,  the  Company  may  require  assurances
reasonably  satisfactory  to it of such  owner's  beneficial  ownership  of such
Registrable Securities.

 

     7. Notices.  All communications  provided for hereunder shall be personally
delivered or sent by telecopier  (and  confirmed by telephone) or by a reputable
overnight courier, and shall be addressed as follows:



          (a) if to the Investor, addressed to it in the manner set forth in the
Purchase  Agreement,  or at such other address as it shall have furnished to the
Company in writing;



          (b) if to any other holder of Registrable  Securities,  at the address
that such holder shall have  furnished to the Company in writing,  or, until any
such other  holder so  furnishes  to the Company an address,  then to and at the
address of the last holder of such  Registrable  Securities who has furnished an
address to the Company; or



          (c) if to the Company,  addressed to it in the manner set forth in the
Purchase Agreement, or at such other address as the Company shall have furnished
to each holder of Registrable Securities at the time outstanding.

                                     - 17 -
<PAGE>
 
                                                             Page 78 of 87 Pages


     8.  Assignment.  This  Agreement  shall be  binding  upon and  inure to the
benefit  of and be  enforceable  by the  parties  hereto  and  their  respective
successors  and  permitted  assigns.  This  Agreement may not be assigned by the
Company.  This  Agreement  and/or the  registration  and other rights  contained
herein  (including these  assignment  rights) may be assigned by the Investor to
any one or more  transferees or  distributees  of all or part of such Investor's
Registrable  Securities.  A holder of Registrable Securities shall be permitted,
in connection  with a transfer or  disposition  of  Registrable  Securities,  to
impose  conditions or constraints on the ability of the transferee,  as a holder
of Registrable Securities, to request a registration pursuant to Section 3.1 and
shall provide the Company with copies of such  conditions or constraints and the
identity of such  transferees.  Notwithstanding  the  foregoing,  this Agreement
and/or the registration and other rights contained herein may not be assigned to
a  transferee  or  distributee  who,  immediately  following  such  transfer  or
distribution,  owns less than one percent of the  Company's  outstanding  Common
Stock.

 

     9. Remedies.  Each holder of Registrable  Securities,  in addition to being
entitled to exercise  all rights  provided  herein or granted by law,  including
recovery of damages,  will be  entitled  to specific  performance  of its rights
under this  Agreement.  The Company  agrees that  monetary  damages would not be
adequate  compensation  for any loss incurred by reason of a breach by it of the
provisions  of this  Agreement  and  hereby  agrees to waive the  defense in any
action for specific  performance that a remedy at law would be adequate.  In any
action  or  proceeding  brought  to  enforce  any  provision  of this  Agreement
(including the indemnification  provisions thereof),  the successful party shall
be entitled to recover  reasonable  attorneys' fees in addition to its costs and
expenses and any other available remedy.

 

     10. No Inconsistent Agreements.  The Company will not, on or after the date
of this Agreement, enter into any agreement with respect to its securities which
is inconsistent with the rights granted to the holders of Registrable Securities
in this Agreement or otherwise conflicts with the provisions hereof. The Company
has not  previously  entered into any agreement  with respect to its  securities
granting  any  registration  rights to any Person  other  than the  registration
rights granted pursuant to this Agreement.  The rights granted to the holders of
Registrable  Securities  hereunder do not in any way  conflict  with and are not
inconsistent  with any other  agreements  to which the  Company is a party or by
which it is bound.  The Company  further  agrees that if any other  registration
rights  agreement  entered into after the date of this Agreement with respect to
any of its  securities  contains  terms  which  are more  favorable  to, or less
restrictive on, the other party thereto than the terms and conditions  contained
in this Agreement are (insofar as they are applicable) to the Investor, then the
terms and conditions of this Agreement shall  immediately be deemed to have been
amended  without  further  action  by the  Company  or any  of  the  holders  of
Registrable  Securities so that such holders shall be entitled to the benefit of
any such more favorable or less restrictive terms or conditions.


                                     - 18 -
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                                                             Page 79 of 87 Pages


     11. Descriptive Headings.  The descriptive headings of the several sections
and  paragraphs of this  Agreement are inserted for reference only and shall not
limit or otherwise affect the meaning hereof.

 

     12. Governing Law;  Submission to Jurisdiction;  Waiver of Jury Trial. This
Agreement shall be construed and enforced in accordance  with, and the rights of
the parties  shall be governed  by, the laws of the State of  Delaware,  without
regard to the conflicts of laws principles  thereof.  Each of the parties hereto
hereby  irrevocably  and  unconditionally  consents  to submit to the  exclusive
jurisdiction  of the courts of the State of  Delaware  and the United  States of
America located in Wilmington, Delaware for any action or proceeding arising out
of or relating to this Agreement and the transactions  contemplated  hereby (and
agrees not to commence any action or proceeding  relating thereto except in such
courts).  Each of the parties  hereto  hereby  irrevocably  and  unconditionally
waives any objection to the laying of venue of any action or proceeding  arising
out of this Agreement or the transactions  contemplated  hereby in the courts of
the State of Delaware  or the United  States of America  located in  Wilmington,
Delaware,  and hereby further irrevocably and unconditionally  waives and agrees
not to  plead or claim in any such  court  that any such  action  or  proceeding
brought in any such court has been brought in an inconvenient forum. The Company
hereby waives any right it may have to a trial by jury in respect of any action,
proceeding  or  litigation  directly or  indirectly  arising out of, under or in
connection with, this Agreement.

 

     13.  Counterparts.  This  Agreement  may  be  executed  in  any  number  of
counterparts,  each  of  which  shall  be  deemed  an  original,  but  all  such
counterparts shall together constitute one and the same instrument.

 

     IN WITNESS  WHEREOF,  the parties have caused this Agreement to be executed
and delivered by their respective  officers  thereunto duly authorized as of the
date first above written.


                                   THE UNIMARK GROUP, INC.


                                   By:/s/ Rafael Vaquero Bazan
                                      ---------------------------------------
                                      Name:  Rafael Vaquero Bazan
                                      Title: President, Chief Executive Officer
                                             and Chief Operating Officer



                                   M & M NOMINEE L.L.C.


                                   By:/s/ Peter Streinger
                                      ----------------------------------------
                                      Name:  Peter Streinger
                                      Title: Manager

 



                                     - 19 -


                                                             Page 80 of 87 Pages


                                    EXHIBIT F

                             SHAREHOLDERS AGREEMENT

     SHAREHOLDERS AGREEMENT (this "Shareholders Agreement") dated as of July 17,
1998, by and among M & M NOMINEE L.L.C.,  a Delaware limited  liability  company
("Purchaser"),  Rafael Vaquero Bazan and Fernando  Camacho Casas  (collectively,
the "Executives"). Certain terms used herein are defined in Section 10.

                               W I T N E S S E T H

     WHEREAS,  contemporaneously  herewith and conditioned hereon, Purchaser and
The UniMark Group,  Inc. (the "Company") are entering into a Purchase  Agreement
(the  "Purchase  Agreement")  providing  for the issuance by the Company and the
purchase by Purchaser of shares of common stock,  par value $0.01 per share,  of
the Company (the "Common Stock"); and
 
     WHEREAS,  the Executives and Purchaser desire to provide for certain rights
and restrictions with regard to their respective ownership of Common Stock.

     NOW, THEREFORE,  in consideration of the mutual covenants herein contained,
the parties agree as follows:

1. Restriction of Sale. (a) From the date hereof until the 18 month  anniversary
hereof,  the Executives  shall not sell,  transfer,  assign,  exchange,  pledge,
encumber or otherwise dispose of (each, a "Transfer") any shares of Common Stock
that they now own or hereafter  acquire or grant any option or right to purchase
such shares or any legal or beneficial  interest  therein,  except in accordance
with  the  provisions  of  this  Shareholders  Agreement.   Notwithstanding  the
foregoing,  nothing  herein shall  prevent  either  Executive  from  effecting a
transfer  of Common  Stock if he is  required  to do so  pursuant  to either the
Margin Agreement between Rafael Vaquero Bazan and Everen Securities, Inc. or the
Margin  Agreement  between  Fernando  Camacho Casas and First London  Securities
Corporation.

     (b)  Notwithstanding  the  provisions of Section 1(a),  the  Executives may
Transfer shares of Common Stock as follows:
 
          (i) each Executive may sell up to 25% of his shares of Common Stock in
     a broadly distributed bona fide public offering of Common Stock pursuant to
     the Securities  Act of 1933, as amended or in regular  broker  transactions
     pursuant to Rule 144A promulgated thereunder;
 
          (ii) each  Executive  may Transfer his shares of Common Stock with the
     prior written consent of Purchaser; and
 
          (iii)  each  Executive  may  Transfer  his  shares  to a member of his
     immediate family;
 
provided,  however, that in the case of clauses (ii) and (iii) the transferee in
such  Transfer  agrees  in  writing  to be  bound  by  all  the  terms  of  this
Shareholders  Agreement  (such  transferee  being  herein  referred  to  as  the
"Permitted  Transferee")  applicable  to  the  Executive  as  if  the  Permitted
Transferee originally had been a party hereto.

<PAGE>

                                                             Page 81 of 87 Pages

     (c) From the date hereof  until the first  anniversary  of the date hereof,
Purchaser  may not Transfer any shares of Common Stock except to an Affiliate of
Purchaser who agrees to be bound by the  provisions  hereof as if such Affiliate
transferee were originally a party hereto.  At any time before,  on or after the
first  anniversary  hereof,  Purchaser  shall not  transfer any shares of Common
Stock to an Affiliate  without  causing such Affiliate to agree in writing to be
bound by the  provisions  hereof as if such  Affiliate  were  originally a party
hereto.

2. Buy - Sell  Arrangement.  (a) At any time after the first  anniversary of the
date hereof,  but only for so long as both a Governance  Termination Event and a
Principal  Termination Event have not occurred, if either group believes, in its
good faith  judgment that a bona fide dispute  exists  between the Groups,  then
such Group (the  "Initiating  Group"),  by written  notice (the "Notice") to the
other Group (the "Other  Group"),  may initiate a buy-sell option (the "Option")
subject to the terms and conditions set forth below.

     (b) The Initiating  Group may initiate the Option only if the holders of at
least 75% of its Specified  Shares  approve such  initiation.  All other actions
taken with  respect to the Option by a Group shall  require the  approval of the
holders of at least a majority of its Specified Shares.

     (c) The Notice shall specify a price per share (or other  security) for all
of the Specified Shares owned by the Other Group. The Other Group shall have the
irrevocable  Option to elect  either  (i) to sell  (the  "Sale  Option")  to the
Initiating  Group (or its  designee)  all of the  Specified  Shares owned by the
Other  Group at the date of receipt of the Notice  (the  "Receipt  Date") at the
price per share (or other  security) set forth in the Notice or (ii) to purchase
(the  "Purchase  Option") all of the  Specified  Shares owned by the  Initiating
Group on the Receipt Date at the price per share (or other  security)  set forth
in the  Notice.  Such  election,  which shall be  irrevocable,  shall be made by
written  notice from the Other Group to the  Initiating  Group within 15 days of
the  Receipt  Date,  provided  however if the Other  Group fails to duly make an
election in this time period,  it shall  conclusively  be deemed to have elected
the Sale Option.

     (d) The closing  (the  "Closing")  of the  purchase and sale under the Sale
Option or the Purchase  Option shall take place at the offices of the Company on
a date  specified  in writing on at least 5 business  days'  notice by the Group
purchasing  the Specified  Shares (the "Buying  Group") to the Group selling its
Specified Shares (the "Selling  Group"),  but in any event within 45 days of the
Receipt Date (subject to  adjournment  if and to the extent  necessary to obtain
any necessary  governmental  approvals or to satisfy any legal waiting periods).
The purchase price shall be payable by the Buying Group (or its designee) to the
Selling  Group in U.S.  dollars in cash or  immediately  available  funds at the
Closing.  At the Closing,  the Selling Group shall transfer its Specified Shares
to the Buying Group (or its designee) and shall deliver such Specified Shares to
the Buying Group (or its designee),  with  appropriate  instruments of transfer,
free and clear of any lien,  claim or  encumbrance.  Pending  the  Closing,  the
Specified  Shares of the Selling Group shall be voted by the Buying  Group,  and
appropriate proxies shall be promptly delivered to effectuate this agreement.

     (e) Each Group shall execute and deliver such  instruments  and agreements,
and shall take such actions,  as may be reasonably  requested by the other Group
to carry out the purposes of this Section 2.

3. Agreement Not to Compete.  (a) Each of the Executives agrees that for so long
as he is  employed  by, or a director  of, the  Company or a  subsidiary  of the
Company,  and  for  18  months  thereafter,  he  will  not  (i)  engage  in  any
"Competitive  Activity," as defined below, within the world (including,  without

                                      -2-

<PAGE>

                                                             Page 82 of 87 Pages


limitation,  anywhere  in the United  States of  America)  or (ii)  directly  or
indirectly solicit for employment,  including, without limitation,  recommending
to any subsequent  employer the  solicitation for employment of, any employee of
the Company.
 
     (b) Each of the  Executives  represents and agrees that he has not and, for
so long as he is employed by or a director of the Company or a subsidiary of the
Company,  and for three years thereafter,  he will not,  appropriate for his own
use,  disclose to any third party, or authorize anyone else to disclose,  unless
authorized by the Company,  any secret,  confidential,  proprietary or financial
information concerning the operations,  future plans, methods of doing business,
or financial condition of the Company or any subsidiary or Affiliate thereof, or
any  customer  lists,  customer  files  or  other  information  relating  to the
customers  of the  Company,  or any  Subsidiary  or  affiliate  thereof  that he
obtained as a result of which his  employment  with the Company and which is not
otherwise  publicly  available (unless it became publicly available in violation
of this Section 3(c)).
 
     (c) Should a court of competent  jurisdiction  determine that any provision
of this Section 3 is  unenforceable,  in period of time,  geographical  area, or
otherwise,  the parties hereto agree that the provision shall be interpreted and
enforced to the maximum extent which such court deems enforceable.
 
 
4. Severability.  Any term, provision, covenant or restriction contained in this
Shareholders  Agreement  held by a court  or  other  governmental  authority  of
competent jurisdiction to be invalid, void or unenforceable shall be ineffective
to the extent of such invalidity, voidness or unenforceability,  but neither the
remaining  terms,  provisions,  covenants  or  restrictions  contained  in  this
Shareholders  Agreement nor the validity or enforceability  thereof in any other
jurisdiction  shall be  affected  or  impaired  thereby.  Any  term,  provision,
covenant or  restriction  contained in this  Shareholders  Agreement  that is so
found to be so broad as to be unenforceable  shall be interpreted to be as broad
as is enforceable.

5. Successors;  No Third Party  Beneficiaries.  The terms and conditions of this
Shareholders  Agreement  shall inure to the  benefit of and be binding  upon the
parties  hereto and their  respective  successors  and assigns.  Nothing in this
Shareholders  Agreement,  expressed  or implied,  is intended to confer upon any
party,  other than the  parties  hereto,  and their  respective  successors  and
assigns, any rights, remedies, obligations, or liabilities under or by reason of
this Shareholders Agreement, except as expressly provided herein.

6. Notices.  All notices or other communications which are required or permitted
hereunder shall be in writing and delivered personally, or sent by telecopier or
reputable overnight courier and delivered to the applicable address as follows:

                  If to Rafael Vaquero Bazan, to him at:
 
                  Industrias Citricolas de Montemorelos, S.A. de C.V.
                  Carretera General Teran Kilometro 1
                  Apartado 87
                  Montemorelos, N.L., Mexico C.P 67500
                  Telecopier: (826) 3-44-17


                                      - 3 -
<PAGE>
                                                             Page 83 of 87 Pages
 
         with a copy to:

         Jakes Jordaan, Esq.
         Jordaan & Pennington
         300 Crescent Court, Suite 1605
         Dallas, TX 75201
         Telecopier: (214) 871-6560

                  If to Fernando Camacho Casas, to him at:
 
                  Operadora Agros, S.A. de C.V.
                  Rio Neva 17
                  Col. Cuauthemoc
                  06500 - Mexico, D.F.
                  Telecopier: 566-7026
 
         with a copy to:

         Jakes Jordaan, Esq.
         Jordaan & Pennington
         300 Crescent Court, Suite 1605
         Dallas, TX 75201
         Telecopier: (214) 871-6560

         If to Purchaser, to:
 
         M & M Nominee L.L.C.
         c/o Soros Fund Management
         888 Seventh Avenue
         New York, NY  10106
         Attention: Chief Financial Officer
         Telecopier: (212) 974-8399
 
         with a copy to:
 
         Promecap, S.C.
         Bosque de Alisos No. 47A, 3er piso
         Colonia Bosques de las Lomas
         C.P. 05120 Mexico, D.F.
         Mexico
         Attention: Federico Chavez Peon
         Telecopier: 011-525-259-6269
 
         with a copy to:

         Joseph Stern, Esq.
         Fried, Frank, Harris, Shriver & Jacobson
         One New York Plaza
         New York, New York  10004
         Telecopier: (214) 859-4000

                                      -4-
<PAGE>
                                                             Page 84 of 87 Pages


7.  Specific  Performance.  The  parties  hereto  agree  that if for any  reason
Purchaser or the Company shall have failed to perform its obligations under this
Shareholders  Agreement,  then  either  party  hereto  seeking to  enforce  this
Shareholders  Agreement against such  non-performing  party shall be entitled to
specific  performance and injunctive and other equitable relief, and the parties
hereto further agree to waive any requirement for the securing or posting of any
bond in connection  with the obtaining of any such injunctive or other equitable
relief.  This  provision  is without  prejudice  to any other rights that either
party  hereto may have against the other party hereto for any failure to perform
its obligations under this Shareholders Agreement.

8. Governing Law. This  Shareholders  Agreement shall be governed by the laws of
the State of Delaware,  without giving effect to the conflict of laws principles
thereof. Each party hereby irrevocably and unconditionally consents to submit to
the  exclusive  jurisdiction  of the courts of the State of Delaware  and of the
United States of America  located in  Wilmington,  Delaware,  for any Litigation
(and agrees not to commence any Litigation except in any such court). Each party
hereby  irrevocably  and  unconditionally  waives any objection to the laying of
venue of any  Action in the  courts of the State of  Delaware  or of the  United
States  of  America  located  in  Wilmington,   Delaware,   and  hereby  further
irrevocably and  unconditionally  waives and agrees not to plead or claim in any
such  court that any  Action  brought  in any such court has been  brought in an
inconvenient forum.

9. Waiver and  Amendment.  Any provision of this  Shareholders  Agreement may be
waived in writing at any time by the party that is entitled  to the  benefits of
such  provision.  This  Shareholders  Agreement  may not be  modified,  amended,
altered or  supplemented  except upon the  execution  and  delivery of a written
agreement executed by the Purchaser and the Executives.

10.  Defined  Terms.  As used herein,  the  following  terms shall be defined as
follows:

     "Affiliate"  shall mean, with respect to any Person,  any other Person that
directly or indirectly  controls,  is controlled  by, or is under common control
with such Person.

     "Competitive  Activity"  shall  mean  engaging  in  any  of  the  following
activities:  (i)  serving as a director  of any  Competitor;  (ii)  directly  or
indirectly  (x)  controlling  any  Competitor  or (y)  owning any equity or debt
interests  in any  Competitor  (other  than equity or debt  interests  which are
publicly  traded and do not exceed 2% of the particular  class of interests then
outstanding)  (it being understood that, if any such interests in any Competitor
are owned by an investment vehicle or other entity in which the Employee owns an
equity  interest,  a portion of the interests in such  Competitor  owned by such
entity shall be attributed to the Employee,  such portion determined by applying
the  percentage  of the equity  interest in such entity owned by the Employee to
the  interests  in such  Competitor  owned by such  entity);  (iii) directly  or
indirectly  soliciting,  diverting,  taking  away,  appropriating  or  otherwise
interfering  with  any of the  customers  or  suppliers  of the  Company  or any
Affiliate controlled by the Company; or (iv) employment by (including serving as
an officer of), or providing consulting services to, any Competitor.

     "Competitor" shall mean any Person that is engaged in a business similar to
any of the  businesses  currently or  hereafter  conducted by the Company or its
subsidiaries  (but not including  businesses  the Company  enters into after the
Executive  is no longer an  employee  or  director  of the Company or any of its
subsidiaries).

                                      -5-
<PAGE>

                                                             Page 85 of 87 Pages


     "Control"  (and  the  correlative  term   "controlling")   shall  mean  the
possession,  directly  or  indirectly,  of the  power to  direct  or  cause  the
direction  of the  management  and policies of any Person,  whether  through the
ownership of equity interests, by contract or otherwise.

     "Governance Termination Event" shall be deemed to have occurred when either
(i) the Purchase  Agreement has been amended or Purchaser has waived  compliance
therewith,  or (ii) Purchaser's  ownership of Common Stock has fallen, in either
event such that the Company is not obliged to observe the covenants set forth in
Section 4.1 and 4.10 of the Purchase Agreement.
 
     "Group" shall mean the Purchaser Group or the Principal Group.
 
     "Person"  shall mean an  individual,  a  corporation,  a limited  liability
company,  a  partnership,  an  association,  a  trust  or any  other  entity  or
organization, including a governmental entity.
 
     "Principal  Group" shall mean the Executives and any Permitted  Transferees
who own any Principal Shares.
 
     "Principal  Shares" shall mean the 927,801  shares of Common Stock owned by
the Executives as of the date hereof, including any securities issued in respect
thereof  as  a  dividend  or  stock-split  or  in  a   reorganization,   merger,
reclassification  or  otherwise,  but  excluding  any  shares  of  Common  Stock
Transferred other than to a Permitted Transferee.
 
     A  "Principal  Termination  Event"  shall be deemed to have  occurred  when
(i) the  Principal Group Transfers  (other than to Permitted  Transferees)  more
than 50% of the Principal  Shares owned by the  Principals as of the date hereof
(adjusted for any stock splits, stock dividends,  recapitalizations  and similar
transactions),  or (ii) neither  Executive is a senior  executive or director of
the Company.
 
     "Purchaser  Group" shall mean Purchaser and any Affiliates of Purchaser who
own any Purchaser Shares.
 
     "Purchaser  Shares" shall mean the shares of Common Stock acquired pursuant
to the Purchase Agreement or the Option Agreement,  dated as of the date hereof,
between  Purchaser and the Company,  including any securities  issued in respect
thereof  as  a  dividend  or  stock-split  or  in  a   reorganization,   merger,
reclassification or otherwise, but excluding any shares Transferred by Purchaser
other than to Affiliates of Purchaser who agree to be bound by the terms hereof.
 
     "Specified  Shares"  shall,  at any time,  mean  with  respect  to  (i) the
Purchaser  Group,  the Purchaser  Shares then owned by the Purchaser  Group, and
(ii) the  Principal  Group,  the  Principal  Shares then owned by the  Principal
Group.
 
     "Subsidiary"  shall mean, with respect to any Person, any other Person more
than  10% of  whose  outstanding  capital  stock or  equity  interests  is owned
directly or indirectly by such Person.


                                      - 6 -

<PAGE>
                                                             Page 86 of 87 Pages


     IN  WITNESS  WHEREOF,   each  of  the  parties  hereto  has  executed  this
Shareholders Agreement as of the date first written above.

                                        PURCHASER:

                                        M & M NOMINEE L.LC.

                                        By:/s/ Peter Streinger
                                           ----------------------------------
                                           Name:  Peter Streinger
                                           Title: Manager

                                        THE EXECUTIVES:

                                        /s/ Rafael Vaquero Bazan
                                        -------------------------------------
                                        Rafael Vaquero Bazan

                                        /s/ Fernando Camacho Casas
                                        -------------------------------------
                                        Fernando Camacho Casas


                                      - 7 -
<PAGE>
                                                             Page 87 of 87 Pages

                                                           
     The undersigned partnership agrees to be bound, as if it were an Executive,
by the  provisions of the foregoing  agreement with respect to the shares of the
Company that it owns.
 
                                        GARZA JASSO Y ASOCIADOS

                                        By:/s/ Rafael Vaquero Bazan
                                           -----------------------------------
                                           Name:  Rafael Vaquero Bazan
                                           Title: General Partner


     The undersigned company agrees to be bound, as if it were an Executive,  by
the  provisions  of the  foregoing  agreement  with respect to the shares of the
Company that it owns.

                                        AGROS S.A. DE CV SOCIEDAD DE 
                                        INVESATOR DE CAPITALES

                                        By:/s/ Fernando Camacho Casas
                                           -----------------------------------
                                           Name:  Fernando Camacho Casas
                                           Title: General Director
 
 
 

                                      - 8 -



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