DEXTER CORP
PREN14A, 2000-02-08
PAINTS, VARNISHES, LACQUERS, ENAMELS & ALLIED PRODS
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                           PRELIMINARY PROXY STATEMENT

              AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION
                               ON FEBRUARY 8, 2000

================================================================================
                            SCHEDULE 14A INFORMATION
                Proxy Statement Pursuant To Section 14 (A) of the
                        Securities Exchange Act of 1934.

Filed by the Registrant [__]
Filed by a Party other than the Registrant [X]

Check the appropriate box:
       [X] Preliminary Proxy Statement
       [__] Confidential, For Use of the Commission Only (as permitted by Rule
            14a-6 (e) (2))
       [__] Definitive Proxy Statement
       [__] Definitive Additional Materials
       [__] Soliciting Material Under Rule 14a-12

                               DEXTER CORPORATION
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                (NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

                      INTERNATIONAL SPECIALTY PRODUCTS INC.
                              ISP INVESTMENTS INC.
- --------------------------------------------------------------------------------
    (NAME OF PERSON (S) FILING PROXY STATEMENT, IF OTHER THAN THE REGISTRANT)

PAYMENT OF FILING FEE (CHECK THE APPROPRIATE BOX):

       [X] No fee required.
       [_] Fee computed on table below per Exchange Act Rules 14a-6(I) (1) and
           0-11.

1)         Title of each class of securities to which transaction applies:



- --------------------------------------------------------------------------------

2)         Aggregate number of securities to which transaction applies:



- --------------------------------------------------------------------------------

3)         Per unit price or other underlying value of transaction computed
           pursuant to Exchange Act Rule 0-11 (set forth the amount on which the
           filing fee is calculated and state how it was determined):



- --------------------------------------------------------------------------------

NY2:\862712\14\54104.0016
<PAGE>


4)         Proposed maximum aggregate value of transaction:



- --------------------------------------------------------------------------------

5)         Total fee paid:



- --------------------------------------------------------------------------------


       [_] Fee paid previously with preliminary materials:


- --------------------------------------------------------------------------------

       [_] Check box if any part of the fee is offset as provided by Exchange
Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was
paid previously. Identify the previous filing by registration statement number,
or the form or schedule and the date of its filing.

           1)         Amount previously paid:
           2)         Form, Schedule or Registration Statement No.:
           3)         Filing Party:
           4)         Date Filed:


================================================================================


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<PAGE>


               PRELIMINARY PROXY MATERIALS DATED FEBRUARY 8, 2000
                              SUBJECT TO COMPLETION


[The information included herein is as it is expected to be when the definitive
proxy statement is mailed to shareholders of Dexter Corporation. This proxy
statement will be revised to reflect actual facts at the time of the filing of
the definitive proxy statement.]

No GOLD Proxy Card is included with these materials.


                                 PROXY STATEMENT

                    OF INTERNATIONAL SPECIALTY PRODUCTS INC.



                       2000 ANNUAL MEETING OF SHAREHOLDERS

                              OF DEXTER CORPORATION




           We are sending this proxy statement to you as one of the holders of
common stock, par value $1.00 per share, of Dexter Corporation, a Connecticut
corporation, in connection with our solicitation of your proxy for use at the
2000 Annual Meeting of Shareholders of Dexter scheduled for [____], local time,
[___] [_______], 2000, at [_________] and at any adjournments or postponements
thereof. We are International Specialty Products Inc. and its wholly owned
subsidiary ISP Investments Inc., each a Delaware corporation, and beneficially
own 9.98% of Dexter's outstanding shares of common stock.

           We have proposed to Dexter a business combination in which all
holders of Dexter common stock would receive $45 per share in cash (the "ISP
Proposal"), subject to the execution of a mutually acceptable merger agreement.
This price represents a 38% premium over Dexter's closing price immediately
prior to our proposal and is higher than the stock has ever traded. Furthermore,
we have expressed our willingness to pay more if Dexter's Board provided
additional information to justify an increased price. Dexter's Board has
rejected our proposal without availing itself of the opportunity to discuss or
negotiate the proposal with us. Dexter then, in an attempt to deter us from a
course of action designed to maximize value for Dexter shareholders, offered to
purchase our shares of Life Technologies, Inc., a majority-owned subsidiary of
Dexter, which offer we promptly rejected. Accordingly, in opposition to the
current Board of Directors of Dexter, we are asking you to approve several
proposals intended to facilitate the ISP Proposal or a superior proposal.

           We are proposing to increase the size of Dexter's Board to seventeen
directors and are nominating ten persons for election as directors. Our nominees
are committed to consider and pursue the ISP Proposal or a superior proposal,
and, if elected, will constitute a majority of the Dexter Board. All
determinations made by our nominees, if elected as directors, will be subject to
their fiduciary duties to you, the shareholders of Dexter.


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<PAGE>

           We believe that the Dexter shareholders - the owners of the
corporation - should be permitted to consider the merits of offers for their
shares. Accordingly, we are also proposing an amendment to the Dexter Bylaws
which will require the Dexter Board to amend Dexter's "poison pill" shareholder
rights plan, or redeem the rights issued thereunder, if the shareholders adopt a
special resolution. Furthermore, we seek your approval of a special resolution
which will require the Board to amend the shareholder rights plan promptly to
make it inapplicable to any offer to purchase all shares of Dexter for at least
$45 per share in cash.

           In order to minimize any attempt by the Dexter Board to frustrate the
consideration or implementation of our proposals, we are also proposing to
repeal any Bylaw amendments adopted unilaterally by the Dexter Board between
February 26, 1999 and the date of the 2000 Annual Meeting. Finally, we are
proposing a resolution to set the order in which our proposals will be voted
upon at the 2000 Annual Meeting.

[THIS PROXY STATEMENT AND THE GOLD PROXY CARD ARE FIRST BEING FURNISHED TO
SHAREHOLDERS ON OR ABOUT _____ __, 2000].

WE URGE YOU TO SIGN, DATE AND RETURN THE GOLD PROXY CARD IN FAVOR OF THE
ELECTION OF OUR NOMINEES AND THE ADOPTION OF THE PROPOSALS DESCRIBED IN THIS
PROXY STATEMENT.

IF YOU HAVE ALREADY SENT A [COLOR] PROXY CARD TO THE DEXTER DIRECTORS, YOU MAY
REVOKE THAT PROXY AND VOTE AGAINST THE ELECTION OF DEXTER'S NOMINEES [AND
PROPOSALS] BY SIGNING, DATING AND RETURNING THE ENCLOSED GOLD PROXY CARD. THE
LATEST DATED PROXY IS THE ONLY ONE THAT COUNTS. SEE "VOTING PROCEDURES" ON PAGE
31.



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<PAGE>


               QUESTIONS AND ANSWERS ABOUT THIS PROXY SOLICITATION

Q:         WHO IS SOLICITING YOUR PROXY?

A:         We are International Specialty Products Inc. ("ISP") and its wholly
           owned subsidiary ISP Investments Inc. As of the date of this proxy
           statement, we beneficially owned 2,299,200 shares of Dexter's common
           stock, representing approximately 9.98% of the outstanding shares. In
           addition, on such date we, together with our reporting "group" for
           Schedule 13D purposes, beneficially owned 5,417,991 shares of common
           stock of Life Technologies, representing approximately 21.7% of the
           outstanding shares of Life Technologies. We are a leading
           multinational manufacturer of specialty chemicals and mineral
           products. For more information on participants in our proxy
           solicitation, please see "Certain Information Concerning the
           Participants" on page 35.

Q:         WHY ARE WE SOLICITING YOUR PROXY?

A:         As one of the largest shareholders of Dexter and an investor in the
           company's shares since September 1998, we have been dissatisfied with
           the failure of Dexter's Board of Directors to take appropriate action
           to maximize shareholder value for Dexter shareholders. Not only has
           Dexter rejected our recommendation of a course of action designed to
           maximize shareholder value, but it has also taken steps to entrench
           Dexter management, contrary to the interests of Dexter shareholders.
           Specifically:

           (1)        On October 4, 1999, one week after we announced that we
                      had acquired 9.98% of the outstanding common stock of
                      Dexter, the Dexter Board amended the company's Rights
                      Agreement (as hereinafter defined) to lower the threshold
                      of beneficial ownership that will trigger the defensive
                      provisions of the Rights Agreement from 20% to 11%.

           (2)        On December 3, 1999, we discussed with representatives of
                      Dexter our belief that Life Technologies, with its higher
                      growth and higher margins, can better fulfill its
                      potential as an independent entity or in combination with
                      another similarly strategically situated company, rather
                      than in combination with Dexter. We therefore recommended
                      that Dexter and Life Technologies be separate corporate
                      entities - a recommendation which we believed would serve
                      to maximize shareholder value for Dexter shareholders.
                      Dexter not only rejected our recommendation, but to date
                      has shown no evidence of having an alternative, credible
                      strategy designed to maximize shareholder value.

           (3)        After Dexter dismissed our recommendation, we proposed a
                      business combination in which all holders of Dexter common
                      stock would receive $45 per share in cash, subject to the
                      execution of a mutually acceptable merger agreement. This
                      price represents a 38% premium over Dexter's closing price
                      immediately prior to our proposal and is higher than the
                      stock has ever traded. Furthermore, we stated that we
                      would be willing to pay more for the shares if Dexter's
                      Board provided additional information


                                       5
<PAGE>

                      to justify an increased price. Dexter's Board rejected our
                      proposal without availing itself of the opportunity to
                      discuss or negotiate the proposal with us. It would be
                      uneconomical for us or any other person to make an offer
                      directly to the Dexter shareholders, due to the "poison
                      pill" rights which would be triggered by a purchase of
                      shares under such an offer. In addition, under Connecticut
                      law, in the absence of Board approval, a person who
                      acquires more than 10% of the outstanding voting stock of
                      a Connecticut corporation in a tender offer is prohibited
                      from effecting a merger to acquire the shares not tendered
                      for a five year period. By not approving the ISP Proposal,
                      Dexter's Board has effectively deprived you of the right
                      to consider for yourself whether or not to accept our
                      acquisition proposal.

           We do not believe that the current Dexter Board will consider and
           pursue the ISP Proposal or a superior proposal. We believe that the
           adoption of our Nominee Election Proposals, Shareholder Rights
           Proposals and Voting Rights Proposals described in this document will
           remove significant impediments to the realization of value for your
           Dexter shares.

Q:         WHY ARE WE ASKING YOU TO INCREASE THE SIZE OF DEXTER'S BOARD AND
           ELECT OUR NOMINEES?

A:         We are soliciting your proxy in favor of our nominees because we
           believe the current directors of Dexter are not acting, and will not
           act, in your best interest. According to Dexter's 1999 Proxy
           Statement, only three of the ten current directors will stand for
           election at the 2000 Annual Meeting. In order to elect a sufficient
           number of directors to constitute a majority of the Board committed
           to consider and pursue the ISP Proposal or a superior proposal, we
           are proposing to increase the number of directors from its current
           number of ten to seventeen, so that a total of ten directors will be
           elected by the shareholders at the 2000 Annual Meeting. We do not
           believe that Dexter's current Board will consider and pursue the ISP
           Proposal or a superior proposal to maximize the value of your shares.
           Our nominees, if elected, will constitute a majority of the Dexter
           Board and are committed to doing so.

Q:         WHO ARE THE NOMINEES?

A:         Our nominees for directorships include eight independent persons who
           are not affiliated with ISP and two persons who are affiliates of
           ISP. Our nominees include well-respected members of the business and
           legal community. All determinations made by our nominees, if elected
           as directors, will be subject to their fiduciary duties to you, the
           shareholders of Dexter. Two of our nominees, Samuel J. Heyman and
           Sunil Kumar, are affiliates of ISP and, if elected to Dexter's Board,
           would not participate in any Board action relating to the ISP
           Proposal or any other business combination transaction while our
           acquisition proposal remains in effect.

Q:         WHY SHOULD SHAREHOLDERS DETERMINE IF THE POISON PILL RIGHTS AGREEMENT
           SHOULD BE AMENDED OR REDEEMED?


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<PAGE>


A:         In 1996, the Board of Directors adopted the Rights Agreement, dated
           as of August 23, 1996, by and between Dexter and ChaseMellon
           Shareholder Services, L.L.C. (as amended, the "Rights Agreement").
           One week after our announcement that we had acquired approximately
           9.98% of the outstanding common stock of Dexter, the Board amended
           the Rights Agreement to lower the threshold of beneficial ownership
           that will trigger the defensive provisions of the Rights Agreement
           from 20% to 11%, applicable to any shareholder who does not file a
           Schedule 13G with the SEC stating that its ownership position has
           been acquired without any intent to change or influence control of
           Dexter. Currently, any person or group who acquires beneficial
           ownership of 11% or more of Dexter's outstanding shares of common
           stock without Board approval and cannot, like institutional
           investors, investment advisors and certain other parties, file a
           Schedule 13G, will experience immediate and substantial economic and
           voting power dilution, because the rights issued to each holder of
           Dexter common stock (other than the holder of greater than 11% of the
           outstanding shares) under the Rights Agreement (the "Rights") would
           then become exercisable to purchase additional shares of common stock
           for each share then outstanding, at one-half the current market
           price. In its current form, we believe that the Rights Agreement is
           harmful to your interests as a shareholder because it is a device
           that gives the Dexter Board the unilateral power to block a
           transaction which would be economically beneficial to you. Dexter's
           Rights Agreement makes it impractical to acquire control of Dexter in
           a transaction opposed by Dexter's Board, even if a significant
           majority of the shareholders were to favor the acquisition. The
           Rights Agreement currently gives Dexter's Board the exclusive power
           and authority to administer the agreement, including the sole power
           to make any determination to redeem or not redeem the Rights or to
           amend the Rights Agreement.

           Our proposed Bylaw amendment would allow the Dexter shareholders to
           protect their own interests, by requiring that the Dexter Board
           follow the direction of a majority of the shareholders with respect
           to the redemption of the Rights or certain amendments of the Rights
           Agreement. In addition, the Dexter Board would be required to seek
           shareholder approval prior to adopting a new "poison pill"
           shareholder rights plan. Our proposal would not eliminate the Rights
           Agreement. The Rights Agreement would remain in effect until the
           Dexter Board has acted, on its own or at the direction of Dexter's
           shareholders, to amend the Rights Agreement to make it inapplicable
           to a proposed offer or transaction or to redeem the Rights. As
           discussed below, we also propose that you direct the Dexter Board to
           promptly amend the Rights Agreement. We also have commenced
           litigation seeking to invalidate the Rights Agreement under
           Connecticut law. See "Certain Litigation."

Q:         WHY DO WE WANT THE BOARD TO AMEND DEXTER'S POISON PILL RIGHTS
           AGREEMENT NOW?

A:         On December 14, 1999, we proposed a business combination in which
           Dexter shareholders would receive $45 per share in cash, subject to
           the execution of a mutually acceptable merger agreement. This price
           represents a 38% premium over the closing price of Dexter's common
           stock immediately prior to our proposal and is higher than the stock
           has ever traded. The Dexter Board has rejected our proposal without
           availing itself of the opportunity to discuss or negotiate the


                                       7
<PAGE>

           proposal with us. It would be uneconomical for us or any third party
           to make an offer directly to the shareholders over the current
           Board's refusal, due to the Rights Agreement. By continuing to refuse
           to amend the Rights Agreement or redeem the rights, Dexter's Board is
           depriving you of the right to consider for yourself whether or not to
           accept any such offer. We believe that the shareholder resolution we
           propose, which would require the Board to amend the Rights Agreement
           to make it inapplicable to any offer for all outstanding shares of
           Dexter for at least $45 per share in cash, is in the best interests
           of all shareholders.

Q:         IS ISP PREPARED TO ACQUIRE DEXTER?

A:         We are prepared to promptly negotiate and execute a mutually
           acceptable merger agreement with Dexter. ISP has received from Chase
           Securities Inc. a letter dated January 20, 2000 pursuant to which
           Chase has informed ISP that, based on the information provided to
           Chase and then-current conditions in the bank syndication market,
           Chase is highly confident in its ability to arrange senior credit
           facilities to, among other things, finance the acquisition of Dexter
           and refinance indebtedness of ISP and Dexter following the
           acquisition.

Q:         WHY ARE YOU PROPOSING TO REPEAL BYLAWS ADOPTED BY THE BOARD?

A:         We propose to repeal any Bylaw amendments adopted by the Board
           between February 26, 1999 and the date of the 2000 Annual Meeting. We
           are not aware of any amendments made between February 26 and now. We
           believe that any Bylaw amendments adopted by the Board prior to the
           2000 Annual Meeting are likely to be aimed at frustrating our
           proposals and therefore are not likely to be in the best interests of
           the Dexter shareholders. Any Bylaw amendments validly adopted by the
           Board prior to the Annual Meeting would remain in effect unless and
           until our proposal to repeal such Bylaws is adopted. If the Board
           adopts any such Bylaw amendments before the 2000 Annual Meeting, it
           will have an opportunity to inform shareholders of the benefits of
           these amendments and to attempt to persuade shareholders to vote
           against this proposal.

Q:         WHO CAN VOTE AT THE 2000 ANNUAL MEETING?

A:         If you owned Dexter shares on [____________, 2000] (the "Record
           Date"), you have the right to vote at the 2000 Annual Meeting. We
           believe that as of the close of business on the Record Date, there
           were __________ shares of common stock of Dexter issued and
           outstanding and entitled to vote. Shareholders have one vote for each
           share of common stock they own with respect to all matters to be
           considered at the 2000 Annual Meeting.

Q:         HOW MANY SHARES MUST BE VOTED IN FAVOR OF THE PROPOSALS TO EFFECT
           THEM?

A:         Assuming that a quorum, the holders of not less than a majority of
           the shares of Common Stock outstanding and entitled to vote, is
           present in person or by proxy at the 2000 Annual Meeting, our
           proposals can be adopted by the following votes:


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           Nominee Proposals -- Election of our nominees for directorships will
           require the affirmative vote of a plurality of the votes cast. The
           election of our nominees for seven newly-created directorships will
           not be effective unless our proposed Bylaw amendment increasing the
           size of Dexter's Board is adopted.

           Proposals Requiring Bylaw Amendments -- We believe that our proposals
           involving amendments to the Dexter Bylaws will be approved if the
           votes cast for the respective proposal exceed the votes cast against
           the respective proposal. We have received the opinion of Connecticut
           counsel that, to the extent the Dexter Bylaws may require a
           two-thirds supermajority shareholder vote for an amendment, such
           provision is invalid under Connecticut law. We have also instituted
           litigation seeking to have any such supermajority amendment
           requirement held ineffective. See "Certain Litigation." If the Bylaws
           are held to contain an effective supermajority shareholder voting
           requirement, our proposals involving Bylaw amendments would each
           require the affirmative vote of the holders of two-thirds of the
           issued and outstanding shares of common stock.

           Proposals Not Requiring Bylaw Amendments -- Adoption of our
           shareholder resolution requiring the Board to amend the Rights
           Agreement and our Omnibus Proposal providing the order for voting at
           the 2000 Annual Meeting will be approved if the votes cast for the
           respective proposals exceed the votes cast against the respective
           proposals. The shareholder resolution as to the Rights Agreement will
           not be effective unless our related Bylaw amendment is adopted.

Q:         WHAT SHOULD YOU DO TO VOTE?

A:         Sign, date and return the enclosed GOLD Proxy card TODAY in the
           envelope provided. For more information on how to vote your shares,
           please see "Voting Procedures" on page 31.

Q:         WHO DO YOU CALL IF YOU HAVE QUESTIONS ABOUT THE SOLICITATION?

A:         Please call Innisfree M&A Incorporated toll free at (888) 750-5834.



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<PAGE>




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                                    IMPORTANT

           PLEASE REVIEW THIS DOCUMENT AND THE ENCLOSED MATERIALS CAREFULLY.
YOUR VOTE IS VERY IMPORTANT, NO MATTER HOW MANY OR HOW FEW SHARES YOU OWN.

1.       If your shares are registered in your own name, please sign, date and
         mail the enclosed GOLD Proxy Card to Innisfree M&A Incorporated in the
         postage-paid envelope provided today.

2.       If you have previously signed and returned a [COLOR] proxy card to
         Dexter, you have every right to change your vote. Only your latest
         dated card will count. You may revoke any [COLOR] proxy card already
         sent to Dexter by signing, dating and mailing the enclosed GOLD Proxy
         Card in the postage-paid envelope provided.

3.       If your shares are held in the name of a brokerage firm, bank nominee
         or other institution, only it can sign a GOLD Proxy Card with respect
         to your shares and only after receiving your specific instructions.
         Accordingly, please sign, date and mail the enclosed GOLD Proxy Card in
         the postage-paid envelope provided. To ensure that your shares are
         voted, you should also contact the person responsible for your account
         and give instructions for a GOLD Proxy Card to be issued representing
         your shares.

4.       After signing the enclosed GOLD Proxy Card, do not sign or return the
         [Dexter's COLOR] proxy card. Do not even use Dexter's [COLOR] proxy
         card to indicate your opposition to Dexter's nominees and proposals.

           If you have any questions about giving your proxy or require
assistance, please call:

                           Innisfree M&A Incorporated
                         501 Madison Avenue, 20th Floor
                            New York, New York 10022
                         Call Toll-Free: (888) 750-5834
             Banks and Brokerage Firms Call Collect: (212) 750-5833
- --------------------------------------------------------------------------------



                                       10
<PAGE>


                          REASONS FOR THE SOLICITATION

           We believe that the current Board of Directors of Dexter has failed
to maximize the value of your investment. The overall purpose of our proposals
is to elect nominees to the Dexter Board who are committed to consider and
pursue the ISP Proposal, in which you would receive $45 per share in cash, or a
superior proposal. Another purpose of our proposals is to permit Dexter
shareholders to consider on their own the merits of offers or transactions for
their shares by issuing instructions to the Board as to the manner in which the
Rights Agreement will be applied to particular offers or transactions and by
directing the Board to make the Rights Agreement inapplicable to offers of at
least $45 per share in cash for all shares.

           As one of the largest shareholders of Dexter and an investor in the
company's shares since September 1998, we have been dissatisfied with the
failure of Dexter's Board of Directors to maximize shareholder value for Dexter
shareholders. On December 3, 1999, we discussed with representatives of Dexter
our belief that Life Technologies, with its higher growth and higher margins,
can better fulfill its potential as an independent entity or in combination with
another similarly strategically situated company, rather than in combination
with Dexter. We therefore recommended that Dexter and Life Technologies be
separate corporate entities - a recommendation which we believed would serve to
maximize shareholder value for Dexter shareholders. Dexter has not only rejected
our recommendation, but to date has shown no evidence of having an alternative,
credible strategy designed to maximize shareholder value. Therefore, on December
14, 1999, we proposed a business combination in which Dexter shareholders would
receive $45 per share in cash, subject to the negotiation of a mutually
acceptable merger agreement. This price represents a premium of 38% over
Dexter's closing price on the day immediately prior to our proposal and is
higher than the stock has ever traded. Furthermore, we have expressed our
willingness to pay more if Dexter's Board provided additional information to
justify an increased price. On December 23, 1999, Dexter's Board rejected our
proposal without availing itself of the opportunity to discuss or negotiate the
proposal with us. Then, on January 20, 2000, Dexter, in an attempt to deter us
from a course of action designed to maximize value for Dexter shareholders,
offered to purchase our shares of Life Technologies for $49 per share, which
offer we promptly rejected. We do not believe that the current Dexter Board will
consider and pursue the ISP Proposal or a superior proposal.

           Our nominees are committed to consider and pursue the ISP Proposal or
a superior proposal. All determinations made by our nominees, if elected to the
Dexter Board, will be subject to their fiduciary duties to you, the shareholders
of Dexter. Two of our nominees, Samuel J. Heyman and Sunil Kumar, are affiliated
with ISP and, if elected to the Dexter Board, would not participate in any Board
action relating to the ISP Proposal or any other business combination
transaction while our acquisition proposal remains in effect.

           We are prepared to promptly negotiate and execute a mutually
acceptable merger agreement with Dexter. ISP has received from Chase Securities
Inc. a letter dated January 20, 2000 pursuant to which Chase has informed ISP
that, based on the information provided to Chase and then-current conditions in
the bank syndication


                                       11
<PAGE>

market, Chase is highly confident in its ability to arrange senior credit
facilities to, among other things, finance the acquisition of Dexter, refinance
indebtedness of ISP and Dexter, pay anticipated expenses and provide working
capital for the combined companies following the acquisition. We have also
engaged Chase Securities Inc. to serve as our financial advisor in connection
with any business combination transaction involving Dexter.

           In connection with our proposals, we have filed a complaint with the
United States District Court for the District of Connecticut in which we are
seeking, among other things, (1) a declaratory judgment that our Nominee
Election Proposals, Shareholder Rights Proposals and Voting Rights Proposals are
valid under Connecticut law, that any supermajority voting requirement contained
in Dexter's Bylaws is invalid, and that the Rights Agreement is invalid, and (2)
an order requiring that the 2000 Annual Meeting be held no later than April 30,
2000. See "Certain Litigation."

           We are soliciting your proxy to vote in favor of the following
proposals at the 2000 Annual Meeting:

       THE NOMINEE ELECTION PROPOSALS

       (1)    The election of our slate of nominees to replace the three
              directors whose terms expire at the 2000 Annual Meeting (the
              "Director Election Proposal");

       (2)    A Bylaw amendment that would increase the size of Dexter's Board
              to permit our nominees for directorships, if elected, to
              constitute a majority of Dexter's Board (the "Board Size Bylaw
              Proposal");

       (3)    The election of our slate of nominees to fill the vacancies
              created by the increased number of directorships (the "Additional
              Directors Election Proposal");

       THE SHAREHOLDER RIGHTS PROPOSALS

       (4)    A Bylaw amendment that would require the Dexter Board to make
              certain amendments to Dexter's "Poison Pill" Rights Agreement or
              redeem the Rights issued thereunder if the shareholders instruct
              the Board to do so by majority vote, and not to adopt a new rights
              agreement without shareholder approval (the "Poison Pill Bylaw
              Proposal");

       (5)    A shareholder resolution directing Dexter's Board to amend the
              Rights Agreement promptly to make it inapplicable to any offer for
              all outstanding shares of Dexter for at least $45 per share in
              cash (the "Poison Pill Amendment Proposal");

       THE VOTING RIGHTS PROPOSALS

       (6)    A shareholder resolution repealing any and all amendments made by
              the Board of Directors to the Bylaws after February 26, 1999 (the
              "Bylaw Repeal Proposal"); and


                                       12
<PAGE>


       (7)    A resolution providing the order for voting at the 2000 Annual
              Meeting (the "Omnibus Proposal").

           EACH OF OUR PROPOSALS IS SEPARATE AND DISTINCT FROM EACH OTHER
PROPOSAL. YOU MAY APPROVE OR VOTE SEPARATELY ON ANY OR ALL OF THE PROPOSALS, BUT
THE ADDITIONAL DIRECTORS ELECTION PROPOSAL WILL NOT BE EFFECTIVE UNLESS THE
BOARD SIZE BYLAW PROPOSAL IS ADOPTED AND THE POISON PILL AMENDMENT PROPOSAL WILL
NOT BE EFFECTIVE UNLESS THE POISON PILL BYLAW PROPOSAL IS ADOPTED.

           WE BELIEVE THAT BY ADOPTING OUR PROPOSALS YOU WILL BE GIVEN THE
OPPORTUNITY TO ELECT NOMINEES TO DEXTER'S BOARD WHO WILL TAKE STEPS CONSISTENT
WITH THEIR FIDUCIARY DUTIES TO ENHANCE THE VALUE OF YOUR SHARES, AND YOU WILL BE
GIVEN THE RIGHT TO DECIDE YOUR OWN FATE WITH RESPECT TO PROPOSED TRANSACTIONS.
WE RECOMMEND THAT YOU SIGN, DATE AND RETURN THE GOLD PROXY CARD TODAY IN FAVOR
OF OUR PROPOSALS.

                               CERTAIN LITIGATION

           On January 27, 2000, we commenced a lawsuit against Dexter and
certain members of Dexter's Board of Directors in the United States District
Court for the District of Connecticut. International Specialty Products Inc. and
ISP Investments Inc v. Dexter Corporation, et al., Civil Action No. 3:00 CV 157
(SRU). The Complaint alleges, among other things, that Article X of Dexter's
bylaws (insofar as it may provide for a two-thirds supermajority vote of the
shareholders to amend the bylaws) violates Section 33-807 of the Connecticut
Business Corporation Act and is therefore invalid; that Dexter's poison pill
violates Section 33-665 of the Connecticut Business Corporation Act and is
therefore invalid; that shareholders have the right to vote on the Nominee
Election Proposals, Shareholder Rights Proposals and Voting Rights Proposals at
the 2000 Annual Meeting; and that the directors have breached their fiduciary
obligations to Dexter and its shareholders. The Complaint seeks declaratory and
injunctive relief as well as money damages. The Complaint also asks the Court to
order that the 2000 Annual Meeting be held no later than April 30, 2000.

                          BACKGROUND AND RECENT EVENTS

           We began purchasing shares of Dexter and Life Technologies common
stock in September 1998 because we believed that the shares of both companies
were substantially undervalued. As one of the largest shareholders of Dexter, we
have been dissatisfied with the failure of Dexter's Board of Directors to
maximize shareholder value for Dexter shareholders. We have discussed with
representatives of Dexter a recommendation which we believed would serve to
maximize shareholder value for Dexter shareholders. Dexter has not only rejected
our recommendation, but to date has shown no evidence of having an alternative,
credible strategy designed to maximize shareholder value. Therefore, on December
14, 1999, we proposed a business combination in which Dexter shareholders would
receive $45 per share in cash, subject to


                                       13
<PAGE>

the negotiation of a mutually acceptable merger agreement. Set forth below is a
summary of events that led to our proposal.

           Life Technologies is the surviving corporation of a merger in 1983 of
Bethesda Research Laboratories, Inc. with a Dexter-owned subsidiary. Dexter
owned approximately 52% of the outstanding stock of Life Technologies in 1998.

           On July 7, 1998, Dexter proposed to purchase the remaining 48% of the
outstanding shares of Life Technologies that it did not already own, at a
purchase price of $37 per share in cash. The proposal was made subject to, among
other things, the approval of the Board of Directors of Life Technologies, and,
since a majority of the Life Technologies Board was affiliated with Dexter, the
approval of the Life Technologies Board's unaffiliated directors. Following
receipt of Dexter's proposal, Life Technologies's Board of Directors formed a
special committee of independent directors (the "Special Committee") to consider
and respond to the proposal. Thomas H. Adams, Ph.D., Frank F. Samuel, Jr. and
Iain C. Wylie were appointed as the members of the Special Committee, with Dr.
Adams to act as chairman. The Special Committee retained outside counsel and a
nationally recognized investment banking firm to assist in their analysis of
Dexter's proposal.

           After a comprehensive valuation of Life Technologies and its
prospects by the Special Committee and its advisors, on October 27, 1998, the
Special Committee reported to the Life Technologies Board that it would be
unable to recommend that Life Technologies shareholders accept Dexter's offer of
$37 per share of Life Technologies stock. Among its findings, the Special
Committee reported that:

       A.     it did not believe that Dexter's proposal adequately reflected the
              value of the prospects of Life Technologies; in particular, the
              Special Committee noted that Dexter's proposal did not adequately
              address the value of Life Technologies's research and development
              pipeline;

       B.     it had received inquiries from a third party interested in
              acquiring all of Life Technologies at a price in excess of
              Dexter's $37 per share offer, but was unable to respond to such
              offer because Dexter had advised that it was not interested in
              disposing of its controlling block of Life Technologies shares;
              and

       C.     Dexter's proposed purchase price of $37 per share of Life
              Technologies common stock was substantially below the $50+ range
              which the Special Committee considered an appropriate price range
              for shares of Life Technologies at that time.

           In response to the Special Committee's findings, K. Grahame Walker,
Chairman and Chief Executive Officer of Dexter and Chairman of the Board of Life
Technologies, proposed that the Life Technologies Board disband the Special
Committee. Mr. Walker also announced that Dexter was withdrawing its original
proposal and would make an offer directly to the shareholders of Life
Technologies to tender their shares for $37 per share in cash. All five of the
directors affiliated with Dexter, representing a majority of the Life
Technologies Board, voted in favor of a resolution to disband the


                                       14
<PAGE>

Special Committee, while all three members of the Special Committee voted
against the resolution. A few days thereafter, two of the three independent Life
Technologies directors who served on the Special Committee (Messrs. Samuel and
Wylie) resigned as directors of Life Technologies in protest of the disbanding
of the Special Committee.

           In his resignation letter, dated November 3, 1998, to the Life
Technologies Board, Frank E. Samuel, Jr. stated that Dexter's proposal "ignored
important components of Life Technologies's overall value, including the value
of the products in Life Technologies's R&D Pipeline." Mr. Samuel further
characterized Dexter's Proposal as "heavyhanded" and as a "coercive attempt to
buy out the [Life Technologies] public stockholders at a price which, I believe,
deprives these stockholders of the significant inherent values to which they are
rightfully entitled." Iain C. Wylie, in his resignation letter to the Life
Technologies Board, echoed Mr. Samuel's concerns with respect to Dexter's
proposal.

           Despite the Special Committee's findings, on November 2, 1998, Dexter
commenced a tender offer for the outstanding shares of Life Technologies at $37
per share. Dexter also announced its intention to acquire any shares not
purchased in the tender offer through a second-step merger in which the
remaining shareholders would receive the same share price paid in the tender
offer.

           On November 16, 1998, Life Technologies filed a Schedule 14D-9
Solicitation/ Recommendation Statement in which Life Technologies disclosed that
the Life Technologies Board would remain neutral and express no opinion with
respect to Dexter's tender offer, since a majority of the Life Technologies
Board was affiliated with Dexter. However, Life Technologies included in the
Schedule 14D-9 the view of the Special Committee that the shareholders should
reject Dexter's tender offer and not tender their shares, along with the
analysis by the investment banking firm hired by the Special Committee which
detailed its finding that Dexter's offer price was inadequate to Life
Technologies shareholders.

           On December 7, 1998, Dexter amended its tender offer by increasing
the purchase price from $37 per share to $39.125 per share and dropping the
condition that Dexter acquire at least 80% of the outstanding shares of Life
Technologies following the consummation of the tender offer. Upon the completion
of the tender offer, Dexter owned approximately 71% of the outstanding shares of
Life Technologies.

           Shortly after the commencement of Dexter's tender offer, in November
1998, we filed a Schedule 13D with respect to our beneficial ownership of shares
of Life Technologies. In the Schedule 13D filing, we stated that we had obtained
an equity position in Life Technologies because the shares of Life Technologies
were undervalued. On November 25, 1998, we signed an agreement with certain
other Life Technologies shareholders for a term of six months that provided for,
among other things, each party not to sell or otherwise dispose of its Life
Technologies shares without the consent of the other parties to the agreement.
Thereafter, we, together with such other Life Technologies shareholders, filed
an amendment to our Schedule 13D reporting our group ownership of Life
Technologies shares. Additional Life Technologies shareholders entered into
similar agreements with us (and additional 13D amendments were filed), so that,
as of December 23, 1998 we, together with the other members of the "13D Group",


                                       15
<PAGE>

owned approximately 26.2% of the outstanding shares of Life Technologies. On
that date, ISP individually owned approximately 14.75% of the outstanding shares
of Life Technologies.

           On February 1, 1999, the common stock of Life Technologies was
delisted from the Nasdaq Stock market because of Life Technologies's inability
to remain in compliance with certain maintenance standards required for
continued listing, including the number of shareholders and public float
requirements, as a result of Dexter's completed tender offer for Life
Technologies's stock. Life Technologies currently remains a reporting company
under the Securities and Exchange Commissions rules and its common stock is
available for quotation on the OTC Bulletin Board.

           On July 26, 1999, Life Technologies announced that its Board had
decided to discontinue regular quarterly dividends on its common stock.

           On September 27, 1999, pursuant to an amended Schedule 13D filing, we
disclosed that we beneficially owned approximately 9.98% of the outstanding
common stock of Dexter. Soon thereafter, on October 4, 1999, the Board of
Directors of Dexter amended the Company's Rights Agreement to lower the
threshold of beneficial ownership that will trigger the defensive provisions of
the Rights Agreement from 20% to 11% of the outstanding common stock of Dexter,
applicable to any shareholder who does not file a Schedule 13G with the SEC
stating that its ownership position has been acquired without any intent to
change or influence control of Dexter.

           On December 3, 1999, representatives of ISP and Dexter met to discuss
our dissatisfaction with Dexter's failure to maximize shareholder value. At such
meeting, we expressed our belief that Life Technologies, with its higher growth
and higher margins, can better fulfill its potential as an independent entity or
in combination with another similarly strategically situated company, rather
than in combination with Dexter. Our representatives noted that there are no
apparent synergies between Dexter and Life Technologies that would justify
Dexter's continued control of Life Technologies and, as an independent company,
Life Technologies would likely have greater access to the capital markets and
receive a higher level of analyst coverage. We therefore recommended that Dexter
and Life Technologies be separate corporate entities - a recommendation which we
believed would serve to maximize shareholder value for Dexter shareholders.

           On December 6, 1999, pursuant to an amended Life Technologies 13D
filing, we disclosed that our initial 13D Group agreement with other Life
Technologies shareholders, which had been renewed and extended on May 10, 1999,
had been further extended until September 30, 2000 by all but one of the
original members of the group. Currently, the continuing members of the 13D
group beneficially own approximately 21.7% of the outstanding shares of Life
Technologies.

           After receiving no response to our proposal made during the December
3, 1999 meeting, on December 14, 1999, Samuel J. Heyman, Chairman of the Board
of ISP, sent the following letter to Mr. Walker proposing to acquire all of the
shares of Dexter not owned by ISP for a price of $45 per share:


                                       16
<PAGE>


           Dear Grahame:

                     It was nice meeting with you, John Thompson, and Bruce
           Beatt on December 3rd.

                     As Kumar Shah and I indicated to you, our interest is in
           the realization of shareholder values for all Dexter Corporation and
           Life Technology shareholders. In this connection, based on our
           analysis, we believe that Life Technologies, with its higher growth
           and higher margins, can better fulfill its potential as an
           independent entity, or in combination with another similarly
           strategically situated company, rather than in combination with
           Dexter Corporation. We also believe that it will be in the best
           interests of both companies and their respective shareholders if
           Dexter Corporation and Life Technologies were separate corporate
           entities.

                     The overriding reason for this conclusion stems primarily
           from the fact that there are practically no overlaps and the
           companies add no value to each other. Specifically, Dexter
           Corporation's R&D, product development and manufacturing technology
           have no interface, and lack any synergy, with Life Technologies.
           Furthermore, we believe that Dexter Corporation has restrained Life
           Technologies' growth by limiting Life Technologies' R&D expenditures,
           new product development and new product introductions. Marketing,
           sales and distribution likewise provide no crossover benefits for the
           two companies. In addition to the operational issues, we note that
           Dexter Corporation management has little or no experience in the life
           science field.

                     From a financial perspective, as an independent company,
           Life Technologies would have much greater access to the capital
           markets, without the constraints of Dexter Corporation's financial
           profile. Life Technologies, as a pure play on which analysts and
           shareholders can more clearly and easily focus, would attract a high
           level of Wall Street coverage, providing the opportunity to achieve
           P/E multiples similar to those achieved by others, who serve the same
           market. This would enable Life Technologies to consummate attractive
           stock acquisitions and mergers in the emerging life science field,
           which you acknowledge has been constrained under your ownership.

                     Finally, as an independent company, or as part of a high
           technology company serving the biotechnology industry, Life
           Technologies would be in a position to provide greater incentives for
           its executives. Through making available stock options with a
           significant upside potential to all key-operating employees, Life
           Technologies would be providing a better opportunity to attract,
           hire, and most importantly, retain quality personnel to insure and
           maximize its continued profitable growth.

                     As a substantial shareholder of both Dexter Corporation and
           Life Technologies, it is our position that, for the foregoing
           reasons, there is value to be realized in the separate corporate
           existence of these two entities.


                                       17
<PAGE>

           At our meeting, while I was pleased that you appeared to share our
           view that there are few, if any, synergies between Dexter Corporation
           and Life Technologies, I had hoped that you would be more receptive
           to our proposal. However, since that time, by your lack of response
           and your recent comments to security analysts, it appears that you
           disagree with our approach to maximizing shareholder value nor do you
           appear to have in mind any alternative strategy for accomplishing the
           same goal.

                     As long term shareholders of both Dexter and Life
           Technologies, we think we have been more than patient. Our Board has
           therefore decided to propose acquiring all of the Dexter Corporation
           common stock not owned by ISP and its affiliates for a price of
           $45.00 per share subject to the execution of a mutually acceptable
           merger agreement. Such a price represents a 38% premium over where
           Dexter Corporation closed last night (32-9/16), and is higher than
           the stock has ever traded. In addition, if you would provide us
           additional information on Dexter Corporation and Life Technologies
           that justifies an increased price we would be willing to pay more. We
           would be willing to enter into a confidentiality agreement in
           connection therewith (but not any such agreement that would limit our
           rights as shareholders).

                     We and our advisors are available to move quickly to
           consummate this transaction. Grahame, please let me know how you and
           your Board would like to proceed.

                                                      Sincerely,

                                                      /s/ Samuel J. Heyman

On December 14, 1999, Dexter issued a press release indicating that it has
received ISP's December 14 letter and that Dexter's Board would consider ISP's
proposed offer, but noting that the December 14th letter did not mention a
source of funds for ISP's cash offer.

In response to Dexter's press release, on December 16, 1999, Mr. Heyman sent the
following letter to Mr. Walker:

           Dear Grahame:

                     I note from Dexter's news release yesterday your mention
           that our letter "contained no information concerning the source of
           funds for its proposal."

                     In this regard, we intend to finance with bank borrowings
           and will provide commitments for such financing as appropriate.

                     As I indicated in yesterday's letter, we stand ready with
           our advisors to meet with you as soon as possible regarding all
           aspects of the proposed merger agreement.

                     All the best.


                                       18
<PAGE>

                                                   Sincerely,

                                                   /s/ Samuel J. Heyman

On December 23, 1999, Mr. Walker sent the following letter to ISP rejecting
ISP's offer to purchase the outstanding shares of Dexter:

           Dear Mr. Heyman:

                     On behalf of Dexter's Board of Directors, I am replying to
           your letter of December 14.

                     The Board has carefully considered your proposal to
           negotiate an acquisition of Dexter at a price of $45 per share. It
           has discussed the proposal as well as the strategic initiatives
           mentioned in your letter with the company's management and its
           advisors - Lehman Brothers and Skadden, Arps. The Board has received
           an opinion from Lehman Brothers that $45 per share is inadequate from
           a financial point of view to the stockholders of Dexter. It is the
           unanimous view of the Board of Directors that your proposal is both
           inadequate and contrary to the best interests of the stockholders of
           Dexter. Accordingly, it is hereby rejected.

                     We noted with interest the research comment on your
           proposal published by Merrill Lynch the same day you made it. Merrill
           Lynch said, "... the bid is too low. It appears that ISP could be
           just trying to put Dexter in play." The comment also noted:
           "Interestingly, ISP's total bid for Dexter is only slightly larger
           than Dexter's bid for Life Technologies - an offer that was deemed as
           too low by ISP management." New Vernon Associates, an institutional
           research firm, was even more definitive in its characterization of
           the ISP proposal. "Mr. Heyman is clearly playing the role of
           arbitrageur here. There is little or no strategic fit between ISP and
           either Dexter or Life Technologies." Yet a third report published by
           Schroders on December 15 was to a similar effect.

                     The Board has thoroughly reviewed the company's present
           circumstances in light of your public proposal to acquire Dexter for
           an inadequate price, ostensibly to separate Dexter and Life
           Technologies. In consequence of that review, they have asked me to
           share the following additional thoughts with you.

                     The Dexter Board is committed to its business strategy of
           maximizing the long-term growth of Dexter through its investment in
           Life Technologies. It will continue these efforts, despite any
           attempt on your part to divert their benefits for ISP's short-term
           interests, as you have done in numerous other cases in which you
           purchased shares of a company - purporting to espouse stockholder
           interests - and subsequently sold out your position at a profit.

                     Last year, in pursuit of its shareholder value growth
           strategy, Dexter decided to strengthen its focus on life sciences.
           Among other initiatives, it sought to acquire the public minority
           shares of Life Technologies. Your company opportunistically
           intervened to frustrate this


                                       19
<PAGE>

           objective and bought 15% of the outstanding shares in the open
           market, while Dexter was proceeding with its tender offer at a price
           that was available to every LTI stockholder. Our Board's plan was to
           realize synergistic benefits and cost savings from 100% ownership of
           LTI, in addition to securing our platform for growth in life
           sciences. The Dexter stockholders have been denied those benefits and
           the related stockholder value enhancement by your actions, not by any
           inadequacy in our basic strategy.

                     The second phase of your opportunistic strategy was an
           open-market purchase program in Dexter shares which purported to be
           "for investment purposes only." Immediately after you assembled a 10%
           block, you dropped your pretense of being a passive investor. You
           invited yourself to a meeting with management, asserted Dexter and
           Life Technologies should be separated, waited 11 days and then made a
           public unsolicited acquisition proposal at an inadequate price
           benefiting only ISP and not all Dexter stockholders. Your disregard
           for the interests - indeed welfare - of Dexter stockholders is
           especially exemplified by the fact that both Moody's and Standard &
           Poor's have now put Dexter on credit watch with negative implications
           expressly as a result of the apprehension that ISP will over-leverage
           in order to combine with Dexter.

                     You have also made some factual assertions about Dexter and
           Life Technologies which are simply wrong and which are potentially
           damaging to one or both companies. Dexter has not been a restraining
           influence on LTI's R&D spending. Indeed, you sought to elicit such a
           statement from the Life Technologies management in your meeting with
           them but they declined to provide it. Nor is there any basis for your
           claim that Dexter's ownership of LTI shares makes it difficult to
           attract, hire and retain quality management. Quite simply, that has
           not been the case. Your contention further implies that the current
           management of LTI is not first rate, a similarly baseless suggestion.

                     You have mischaracterized the relationship between Dexter
           and Life Technologies, and your position is internally inconsistent.
           You affirmatively asserted in our conversation on December 3 that
           Life Technologies has no place with ISP. We agree. However, it is
           illogical and self-contradictory for you to suggest that you wish to
           acquire Dexter in order to spin off Life Technologies in some
           unspecified transaction likely to have adverse tax consequences to
           all participants. Second, and more important by far, we are convinced
           that both Dexter and Life Technologies have bright future prospects
           which justify a valuation of Dexter shares significantly in excess of
           what is reflected in the current market price. We fervently hope (and
           strongly recommend) that you return your managerial focus to your own
           companies, leaving the stewardship of Dexter and LTI where it belongs
           - with their respective Boards.


                                                  Sincerely

                                                  /s/ K. Grahame Walker


                                       20
<PAGE>

           In a complaint dated January 18, 2000, shareholders of Dexter
asserted claims on behalf of a putative class consisting of all Dexter
shareholders against Dexter, Mr.Walker and the directors of Dexter in
Connecticut Superior Court (asserting two separate claims formerly brought in
Delaware). Such shareholders allege, among other things, that "[i]n rejecting
the ISP offer, reducing the threshold for activation of the shareholder rights
plan and failing to make any attempts to negotiate with ISP, [Dexter, Mr. Walker
and the Board] have acted wrongfully to the detriment of Dexter public
stockholders."


           On January 20, 2000, Dexter announced that it had sent a letter to
Life Technologies proposing to acquire for $49.00 per share the 28.5% of Life
Technologies that Dexter does not own in a merger transaction. Dexter asked for
"appropriate indications of support" for the merger from ISP and the other
members of the 13D group.

           On January 27, 2000, Mr. Heyman sent the following letter to Mr.
Walker:

           Dear Grahame:

                     In view of ISP's $45 all cash offer and our stated
           willingness to pay more if additional information justified a higher
           price, I was disappointed that your Board did not decide to encourage
           negotiations with a view toward increasing shareholder value for
           Dexter shareholders. Its refusal to do so leaves us no choice but to
           take our proposal directly to our fellow shareholders.

                     We are today delivering to your Corporate Secretary a
           notice of our intention to present a series of resolutions at your
           April Annual Meeting. The effect of the resolutions is to elect ten
           of our nominees to the Dexter Board, including eight directors
           independent of ISP, who are committed to considering and pursuing
           ISP's offer or a superior proposal. We are also proposing a by-law
           amendment and a resolution requiring Dexter's Board to remove its
           "poison pill" in favor of offers for all shares of at least $45 per
           share in cash. We intend to solicit proxies in favor of these
           resolutions.

                     Your December 23rd letter questioned the seriousness of
           ISP's intent. First, as you know, ISP currently holds a stake in
           Dexter which is more than five times that held by Dexter's entire
           Board. Second, so that there should be no doubt as to our ability to
           finance the acquisition, Chase Securities Inc. advised us, confirmed
           in writing, that they are highly confident in their ability to
           arrange the credit facilities for this acquisition.

                     There are so many inaccuracies and mischaracterizations in
           your letter that I find it difficult to know where to start. By way
           of just one example, your heavy reliance upon security analysts to
           defend your rejection of our proposal is misplaced. For instance, in
           comparing ISP's offer to Dexter's bid last year for Life
           Technologies, the Merrill Lynch report contained an error of almost
           $300 million by ignoring the value of the minority interests. Also,
           you failed to quote a


                                       21
<PAGE>

           relevant section of the New Vernon Associates report you cited, which
           states the following: "there is little or no interplay between the
           company's [Dexter's] industrial and life sciences businesses," "we do
           find merit in his [Mr. Heyman's] initiative to separate the company's
           [Dexter's] disparate assets," and "in our view Dexter's ownership of
           LTEK is constraining the latter company's ability to recruit and
           retain key employees." With regard to the last point, it should be
           made clear that we indeed view the management of Life Technologies as
           first rate. However, your attempted squeeze-out of the minority
           shareholders more than a year ago resulted in the elimination of
           meaningful stock incentives for Life Technologies executives, which
           ultimately impacts the ability to retain and recruit key personnel.

                     As you know, Life Technologies' shareholders have rejected
           Dexter's recent belated $49 per share offer. Parenthetically, it
           should be noted that Dexter's own shareholders appear to have
           rejected its business strategy as well, as Dexter's stock price has
           declined substantially since the company's rejection of our offer and
           its decision to attempt to acquire 100% of Life Technologies. It is
           apparent from the timing of Dexter's offer for our Life Technologies
           shares, coming on the heels of ISP's $45 per share offer for Dexter,
           upon which many of Dexter's shareholders have relied, seeks to divert
           ISP from a course of action designed to maximize shareholder values
           for all Dexter shareholders. In this connection, we believe that
           Dexter's attempt to deter us by providing benefits to ISP not
           available to other Dexter shareholders is simply not appropriate.

                     Grahame, I just do not think it would be productive at this
           time to respond to your mischaracterizations and attempts to impugn
           our motives - which by the way I do not appreciate. The real issue
           here, however, is the maximization of shareholder value for all
           Dexter shareholders, and I believe that shareholders will more likely
           benefit from a dialogue along this line. In fact, I would be willing
           to appear with you before any group of Dexter shareholders to discuss
           the merits of Dexter's proposed course of action vs. ISP's offer.

                     All the best.

                                                   Sincerely,

                                                   /s/ Samuel J. Heyman

           Also on January 27, 2000, we gave formal written notice to Dexter of
our intention to bring our proposals before the 2000 Annual Meeting. On that
same day, we filed a complaint against Dexter and certain members of Dexter's
Board of Directors in the United States District Court for the District of
Connecticut. See "Certain Litigation." These developments were reflected in an
amended 13D filing with respect to our Dexter shares on the same day.

           On January 28, 2000, we, together with the other members of our 13D
Group, amended our 13D filing with respect to the 13D Group's Life Technologies
shares reflecting the rejection of Dexter's offer for Life Technologies. Also on
January 28, we demanded a copy of Dexter's shareholder list and certain other
corporate information to which we are entitled under the Connecticut Business
Corporation Act.




                                       22
<PAGE>


                                  THE PROPOSALS

           We are soliciting your proxy in favor of adopting the following three
sets of proposals at the 2000 Annual Meeting, in opposition to Dexter's Board of
Directors: (1) the Nominee Election Proposals, (2) the Shareholder Rights
Proposals and (3) the Voting Rights Proposals. The full text of shareholder
resolutions to effect each proposal are contained in the respective Annexes to
this proxy statement.

EACH OF OUR PROPOSALS IS SEPARATE AND DISTINCT FROM EACH OTHER PROPOSAL. YOU MAY
APPROVE OR VOTE SEPARATELY ON ANY OR ALL OF THE PROPOSALS, BUT THE ADDITIONAL
DIRECTORS ELECTION PROPOSAL WILL NOT BE EFFECTIVE UNLESS THE BOARD SIZE BYLAW
PROPOSAL IS ADOPTED, AND THE POISON PILL AMENDMENT PROPOSAL WILL NOT BE
EFFECTIVE UNLESS THE POISON PILL BYLAW PROPOSAL IS ADOPTED.

THE NOMINEE ELECTION PROPOSALS

       PROPOSAL NO. 1: THE DIRECTOR ELECTION PROPOSAL

           According to publicly available information, Dexter currently has ten
directors, divided into three classes having staggered terms of three years
each. The terms of one class of incumbent directors, consisting of Charles H.
Curl, Peter G. Kelly and Jean Francois Saglio, will expire at the 2000 Annual
Meeting. Accordingly, at the 2000 Annual Meeting, you will be asked to elect
three persons to fill the directorships in this class for a three-year term
continuing until the 2003 Annual Meeting and the election and qualification of
each person's respective successor. The following persons are our nominees for
election as directors in such class:

<TABLE>
<CAPTION>
Name and Business                         Present Principal Occupation and Five Year
Address                           Age     Employment History                                        Class
- -------                           ---     ------------------                                        -----
<S>                               <C>                                                               <C>
Samuel J. Heyman                  61      Mr. Heyman has been a director and Chairman of            2003
1361 Alps Road                            ISP since its formation and served as its Chief
Wayne, New Jersey 07470                   Executive Officer from its formation until June
                                          1999. He has also been a director, Chairman and
                                          Chief Executive Officer of GAF Corporation
                                          ("GAF"), primarily a holding company, and
                                          certain of its subsidiaries for more than five
                                          years. Mr. Heyman has been a director and
                                          Chairman of Building Materials Corporation of
                                          America ("BMCA"), an indirect, approximately
                                          97%-owned subsidiary of GAF primarily engaged
                                          in the commercial and residential roofing
                                          business, since its formation, and has served
                                          as Chief Executive Officer of BMCA since June
                                          1999, a position he also held from June 1996 to
                                          January 1999. He is also the Chief Executive
                                          Officer, Manager and General Partner of a
                                          number of


                                       23
<PAGE>

                                          closely held real estate development companies
                                          and partnerships whose investments include
                                          commercial real estate and a portfolio of
                                          publicly traded securities.

Sunil Kumar                       50      Mr. Kumar has been a director, President and              2003
1361 Alps Road                            Chief Executive Officer of ISP since June 1999.
Wayne, New Jersey 07470                   Mr. Kumar has also been President and Chief
                                          Executive Officer of certain subsidiaries of
                                          ISP, including ISP Investments Inc., since June
                                          1999. Mr. Kumar was a director, President and
                                          Chief Executive Officer of BMCA from May 1995,
                                          July 1996 and January 1999, respectively, until
                                          June 1999. He was Chief Operating Officer of
                                          BMCA from March 1996 to January 1999. Mr. Kumar
                                          also was President, Commercial Roofing Products
                                          Division, and Vice President of BMCA from
                                          February 1995 to March 1996. From 1992 to
                                          February 1995, he was Executive Vice President
                                          of Bridgestone/Firestone, Inc., a retail
                                          distributor and manufacturer of tires and
                                          provider of automobile services.


Philip Peller                     60      Prior to his retirement on November 30, 1999,             2003
                                          Mr. Peller was a partner of Andersen Worldwide
                                          S.C. and Arthur Andersen LLP, a role he had
                                          held since 1970. He served as Managing Partner
                                          - Practice Protection and Partner Affairs for
                                          Andersen Worldwide during the period 1998 to
                                          1999 and as Managing Partner - Practice
                                          Protection from 1996 to 1998. During the period
                                          1995 to 1996, he was the Managing Director -
                                          Quality, Risk Management and Professional
                                          Competence for Arthur Andersen's global audit
                                          practice.
</TABLE>

           Each of the nominees has consented to serve as a director until the
expiration of his respective term and until such nominee's successor has been
elected and qualified or until the earlier resignation or removal of such
nominee. We have no reason to believe that any of the nominees named above will
be disqualified or unable or unwilling to serve if elected. If any of the
nominees should become unavailable for any reason, proxies may be voted for
another person nominated by ISP to fill the vacancy.

           The nominees understand that, if elected as directors of Dexter, each
of them will have an obligation under Connecticut law to discharge his duties as
a director in good faith, consistent with his fiduciary duties to Dexter and its
shareholders.

                       WE STRONGLY RECOMMEND THAT YOU VOTE
                       "FOR" THE ELECTION OF OUR NOMINEES


                                       24
<PAGE>

       PROPOSAL NO. 2: THE BOARD SIZE BYLAW PROPOSAL

           We are proposing a Bylaw amendment that would increase the Dexter
Board from its current size of ten to seventeen directors commencing at the 2000
Annual Meeting. If our Board Size Bylaw Proposal is adopted, the shareholders of
Dexter would be entitled to elect, in addition to the three directors under
Proposal No. 1 above, seven additional directors, for a total of ten directors
at the 2000 Annual Meeting. The Board Size Bylaw Proposal would allow the Dexter
shareholders to elect a majority of the Dexter Board at the 2000 Annual Meeting.

           The Board Size Bylaw Proposal provides that the seven additional
directorships proposed will be allocated to the classes with terms expiring at
the 2001 Annual Meeting and the 2002 Annual Meeting, unless the additional
nominees are allocated to the class with a term expiring at the 2003 Annual
Meeting by the Board, consistent with its duties under Connecticut law to
allocate directors among the three classes so that all classes are equal in size
to the extent possible.

           The proposed Bylaw amendment, if adopted, cannot be unilaterally
repealed by the Dexter Board. The full text of the Bylaw amendment to effect the
Board Size Bylaw Proposal is contained in Annex I to this proxy statement.

                       WE STRONGLY RECOMMEND THAT YOU VOTE
                       "FOR" THE BOARD SIZE BYLAW PROPOSAL

       PROPOSAL NO. 3: THE ADDITIONAL DIRECTORS ELECTION PROPOSAL

           If the Board Size Bylaw Proposal is adopted, we nominate the
following persons to the Board to fill the newly-created directorships. Our
proposal provides that our nominees will be assigned to classes as indicated
below, unless the additional nominees are allocated to the class with a term
expiring at the 2003 Annual Meeting by the Board, consistent with its duties
under Connecticut law.

<TABLE>
<CAPTION>
Name and Business                         Present Principal Occupation and Five Year
Address                           Age     Employment History                                        Class
- -------                           ---     ------------------                                        -----
<S>                               <C>                                                               <C>
Alan Meckler                       54     Mr. Meckler has been the Chairman and Chief               2002
501 Fifth Avenue                          Executive Officer of Internet.com Corp., a
New York, NY                              provider of global real-time news and
10017                                     information resources for the internet
                                          industry, since December 1998. He was Chairman
                                          and Chief Executive Officer of Mecklermedia
                                          Corp., a provider of internet information, from
                                          June 1971 to November 30, 1998.


Dan Ogden                         52      Mr. Ogden has been the President and Chief                2002
Yokohama Tire                             Operating Officer of Yokohama Tire Corporation,


                                       25
<PAGE>

Corporation                               the North American marketing arm of Yokohama
601 S. Acacia                             Rubber Company, a worldwide tire manufacturer,
Fullerton, CA 92834-4550                  since August 1997. From September 1996 until
                                          August 1997, Mr. Ogden was engaged in private
                                          investment activities. He was President and
                                          Chief Operating Officer of EMCO Enterprises,
                                          Inc., a diversified manufacturer primarily of
                                          storm and screen doors, from December 1992
                                          until August 1996.

Morrison DeSoto Webb              52       Mr. Webb has been an attorney in private                 2002
120 Rye Ridge Road                         practice since January 2000. He was Executive
Harrison, NY 10528                         Vice President - External Affairs and Corporate
                                           Communications at Bell Atlantic Corporation
                                           from August 1997 until December 1999. From May
                                           1995 until August 1997, Mr. Webb was Executive
                                           Vice President, General Counsel and Secretary
                                           of NYNEX Corporation. He was Vice President -
                                           General Counsel of New England Telephone and
                                           Telegraph Company, a subsidiary of NYNEX
                                           Corporation, from 1991 until 1995 and Vice
                                           President - General Counsel of New York
                                           Telephone Company, a subsidiary of NYNEX
                                           Corporation from 1994 until 1995.

Robert Englander                  57       Mr. Englander has been the Chairman of the               2002
75 Holly Hill Lane                         Board and Chief Executive Officer of Belvoir
Greenwich, CT 06830                        Publications, a publisher of aviation, marine,
                                           electronic, equestrian and other special
                                           interest books, videos and publications, since
                                           February 1973.

John Droney                       53       Mr. Droney has been an attorney with Levy &              2001
74 Batterson Park Road                     Droney, P.C. since February 1988. Mr. Droney
Farmington, CT 06032                       was also Chairman of the Democratic State
                                           Central Committee of Connecticut and a member
                                           of the Democratic National Committee from 1986
                                           to 1992.

Anthony T. Kronman                54       Mr. Kronman has been Dean and Professor of Law           2001
127 Wall Street                            at Yale Law School since 1994 and 1978,
New Haven, CT 06511                        respectively.

Vincent Tese                      56       Mr. Tese has been the Chairman of Wireless               2001
Wireless Cable                             Cable International Inc., a cable television
   International,                          and wireless communications service provider,
   Inc. c/o Bear                           since April 1995. Mr. Tese was Chairman of


                                       26
<PAGE>

   Stearns & Co.                           Cross Country Wireless Inc., also a cable
   Inc.                                    television and wireless communications service
245 Park Avenue                            provider, from October 1994 to July 1995. Mr.
New York, NY                               Tese was the Director of Economic Development
10167                                      for the State of New York from June 1987 to
                                           December 1994 and also served as the Chairman
                                           of the Urban Development Corporation in New
                                           York from 1985 to 1994. Mr. Tese currently
                                           serves as a director of Allied Waste
                                           Industries, Inc., Bear Stearns Companies Inc.,
                                           Bowne & Co., Inc., Cablevision Systems Corp.,
                                           Keyspan Corp. and Maek-Cali Realty Corp.
</TABLE>

           Each of the nominees has consented to serve as a director until the
expiration of his respective term and until such nominee's successor has been
elected and qualified or until the earlier resignation or removal of such
nominee. We have no reason to believe that any of the nominees named above will
be disqualified or unable or unwilling to serve if elected. If any of the
nominees should become unavailable for any reason, proxies may be voted for
another person nominated by ISP to fill the vacancy.

           The nominees understand that, if elected as directors of Dexter, each
of them will have an obligation under Connecticut law to discharge his duties as
a director in good faith, consistently with his fiduciary duties to Dexter and
its shareholders. The full text of a shareholder resolution to effect the
Additional Directors Election Proposal is contained in Annex II to this proxy
statement.

                       WE STRONGLY RECOMMEND THAT YOU VOTE
                  "FOR" THE ELECTION OF OUR ADDITIONAL NOMINEES
                     TO FILL THE NEWLY-CREATED DIRECTORSHIPS


THE SHAREHOLDER RIGHTS PROPOSALS

       PROPOSAL NO. 4:  THE POISON PILL BYLAW PROPOSAL

           We are proposing an amendment to the Bylaws which would require the
Dexter Board to make certain amendments to the Rights Agreement or redeem the
Rights issued thereunder if shareholders representing a majority of the voting
power of Dexter adopt a special resolution requiring the Board to do so. In
addition, our proposed amendment would require the Dexter Board to obtain
shareholder approval prior to adopting any new shareholder rights plan, rights
agreement or any other form of "poison pill" which is designed to or has the
effect of making acquisitions of large holdings of Dexter's shares of stock more
difficult or expensive. The complete text of our proposed Bylaw amendment to
effect the Poison Pill Bylaw Proposal is included as Annex II to this proxy
statement.

           The Rights Agreement currently vests with the Dexter Board the
exclusive power and authority to administer the agreement, including the sole
power to make any determination to redeem or not redeem the rights or to amend
the Rights Agreement.


                                       27
<PAGE>

Our proposal would allow the shareholders to make their own decision with
respect to proposed offers or transactions, by requiring that the Dexter Board
follow the direction of the shareholders with respect to the amendment or
replacement of the Rights Agreement or the redemption of the Rights issued
thereunder.

           Poison pills are considered extremely potent corporate takeover
defense mechanisms, and Dexter's existing Rights Agreement may, in some
respects, be aligned with shareholder interests. Proponents of poison pills
assert that rights plans, such as the Rights Agreement, enable the board to
respond in an orderly manner to unsolicited bids by providing sufficient time to
carefully evaluate the fairness of an unsolicited offer and the credibility of
the bidder, and thereby giving the board the flexibility to explore alternative
strategies for maximizing shareholder value. It has been argued that poison
pills deter abusive takeover tactics. Proponents of poison pills also assert
that rights plans provide incentives for a potential bidder to negotiate in good
faith with the board, and that such negotiations are likely to maximize value
for shareholders by soliciting the highest possible price from the bidder.

           Our proposed Bylaw amendment does not nullify the Rights Agreement.
If our Poison Pill Bylaw Proposal is adopted, the Rights Agreement will remain
in effect to deter unsolicited, undervalued proposals. In order to make the
Rights inapplicable to a proposed offer or transaction, either the Dexter Board
must act by majority vote, or the shareholders must act. If the shareholders
wish to mandate the Board to redeem the Rights or amend the Rights Agreement,
the shareholders will, in instances where an annual meeting is not pending, face
the procedural necessity of calling a special meeting of shareholders, an action
which requires the written request of the holders of not less than 35% of the
issued and outstanding shares of Dexter common stock. Our proposal will not
leave Dexter defenseless against unsolicited bids.

           Dexter's Certificate of Incorporation and Connecticut law provide
additional significant impediments to many forms of unsolicited offers for
Dexter. The Certificate provides that: (1) directors serve staggered terms,
preventing any independent shareholder or group of shareholders from gaining a
majority of the seats on the Board in a single year, absent an amendment to the
Bylaws approved by the shareholders, and (2) Dexter has authorized for issuance
a "blank check" preferred stock that can be used to dilute the ownership or
voting power of a bidder not approved by the Board. Connecticut law provides
that: (a) certain transactions with a beneficial owner of more than 10% of
Dexter's voting stock, including mergers, are subject to approval by the Board,
80% of the voting power of the outstanding shares and 66-2/3% of voting power of
the disinterested shareholders, unless certain "fair price" requirements are met
and (b) business combinations with a beneficial owner of more than 10% of
Dexter's voting stock are prohibited for five years, unless approved by the
Board. In addition, Connecticut law requires directors in exercising their
fiduciary duties to consider, in addition to the interests of shareholders, the
interests of the corporation, its employees, customers, creditors and suppliers,
and the interests of the community and society.

           Shareholders have opposed poison pills on the grounds that poison
pills force potential investors to negotiate potential acquisitions with
management, instead of making their offer directly to the shareholders. In
recent years, shareholders have, with increased frequency, taken steps to oppose
the unilateral adoption of such poison pill


                                       28
<PAGE>

rights plans by management. We believe that the entrenchment and consequential
lack of accountability afforded to incumbent management and directors by poison
pills may adversely affect shareholder value, because they provide a board with
veto power over change in control bids, even when shareholders believe that such
bids are in their best interests. We believe that our Poison Pill Bylaw Proposal
will permit you to decide when a change in control offer is in your best
interest, without eliminating the potential beneficial effect of the Rights
Agreement to shareholder value.

           We believe that the Bylaw amendment effecting the Poison Pill Bylaw
Proposal is valid under Connecticut law because Connecticut law authorizes
shareholders to adopt bylaws that relate to the powers of the shareholders and
the board of directors. However, we recognize that the Connecticut courts have
not considered the validity of our proposed amendment or any similar bylaw and,
therefore, have not resolved the extent to which shareholder-adopted bylaws may
limit the authority of the board of directors to oppose, or to adopt or employ
defensive measures against, takeover bids favored by a majority of the
shareholders. We anticipate that the current Dexter Board will assert that
shareholders cannot adopt such a Bylaw. We are seeking a declaratory judgment to
establish the validity of the Poison Pill Amendment Proposal. See "Certain
Litigation."

                       WE STRONGLY RECOMMEND THAT YOU VOTE
                      "FOR" THE POISON PILL BYLAW PROPOSAL.


       PROPOSAL NO. 5: THE POISON PILL AMENDMENT PROPOSAL

           In connection with the Bylaw amendment in Proposal No. 4 above, we
are proposing the adoption of a special shareholder resolution. The resolution
will require the Board to amend the Rights Agreement to make it inapplicable to
any offer for all outstanding Dexter shares of common stock at a price of at
least $45 per share in cash. If the Poison Pill Bylaw Proposal is adopted, the
Rights Agreement will remain in full force and effect with respect to all offers
for less than $45 per share in cash or with respect to offers for less than all
shares. The full text of a resolution implementing the Poison Pill Amendment
Proposal is included as Annex IV to this proxy statement.

                       WE STRONGLY RECOMMEND THAT YOU VOTE
                    "FOR" THE POISON PILL AMENDMENT PROPOSAL.


THE VOTING RIGHTS PROPOSALS

       PROPOSAL NO. 6: THE BYLAW REPEAL PROPOSAL.

           Article X of the Dexter Bylaws provides that Bylaws may be repealed
by the shareholders. We propose to repeal any Bylaw amendments adopted by the
Board between February 26, 1999 and the date of the 2000 Annual Meeting. The
purpose of this proposal is to prevent the Board from interfering with the
implementation of the proposals being acted upon by the shareholders pursuant to
this proxy solicitation. The complete text of our proposed shareholder
resolution to effect the Bylaw Repeal Proposal is included as Annex V to this
proxy statement.


                                       29
<PAGE>


           We believe that any Bylaw amendments adopted by the Board prior to
the 2000 Annual Meeting are likely to be aimed at frustrating our proposals and
therefore are not likely to be in the best interests of the Dexter shareholders.
We are not aware of any Bylaw amendments adopted by the Board since February 26,
1999. Any Bylaw amendments validly adopted by the Board prior to the Annual
Meeting would remain in effect unless and until our proposal to repeal such
Bylaws is adopted. If the Board adopts any such Bylaw amendments before the 2000
Annual Meeting, it will have an opportunity to inform shareholders of the
benefits of these amendments and to attempt to persuade shareholders to vote
against this proposal.

                       WE STRONGLY RECOMMEND THAT YOU VOTE
                        "FOR" THE BYLAW REPEAL PROPOSAL.


       PROPOSAL NO. 7: THE OMNIBUS PROPOSAL

           In addition, the shareholders will be asked at the 2000 Annual
Meeting to consider the Omnibus Proposal, which sets forth the following order
in which our proposals will be voted upon by the shareholders:

           1.         The Omnibus Proposal;

           2.         The Bylaw Repeal Proposal;

           3.         The Director Election Proposal;

           4.         The Board Size Bylaw Proposals;

           5.         The Additional Directors Election Proposal;

           6.         The Poison Pill Bylaw Proposal; and

           7.         The Poison Pill Amendment Proposal.

           The full text of a shareholder resolution to effect the Omnibus
Proposal is contained in Annex VI to this proxy statement.


                         WE STRONGLY RECOMMEND THAT YOU
                        VOTE "FOR" THE OMNIBUS PROPOSAL.


                         OTHER MATTERS TO BE CONSIDERED
                           AT THE 2000 ANNUAL MEETING

RATIFICATION OF APPOINTMENT OF INDEPENDENT AUDITORS

           As set forth in Dexter's Proxy Statement, at the 2000 Annual Meeting,
the shareholders will be asked to ratify the appointment by the Dexter Board of


                                       30
<PAGE>


PricewaterhouseCoopers LLP as Dexter's independent auditors for the year 2000.
We are not making any recommendation on this proposal.

OTHER PROPOSALS

           Except as set forth above, we are not aware of any proposals to be
brought before the 2000 Annual Meeting. However, we have notified Dexter of our
intention to bring before the 2000 Annual Meeting such business as may be
appropriate, including without limitation nominating additional persons for
directorships, to address any action of the Dexter Board not publicly disclosed
prior to the date of this proxy statement. Should other proposals be brought
before the 2000 Annual Meeting, the persons named as proxies in the enclosed
GOLD proxy card will vote on such matters in their discretion.

                                VOTING PROCEDURES

           In order to ensure that your views on the proposals are heard by
Dexter and your vote represented at the 2000 Annual Meeting, we urge you to sign
and date the enclosed GOLD Proxy Card and return it to Innisfree M&A
Incorporated, 501 Madison Avenue, 20th Floor, New York, New York 10022, in the
enclosed postage paid envelope TODAY. Execution of the GOLD Proxy Card will not
affect your right to attend the 2000 Annual Meeting and to vote in person.

           You are eligible to execute a GOLD Proxy only if you owned the Common
Stock on the Record Date. Dexter's Board has set _________, 2000 as the Record
Date for determining those shareholders who will be entitled to notice of and to
vote at the 2000 Annual Meeting. You will retain the right to execute a proxy
card in connection with this proxy solicitation even if you sell your shares
after the Record Date. Accordingly, it is important that you vote the Shares
held by you on the Record Date, or grant a proxy to vote such Shares on the GOLD
proxy card, even if you sell such shares after the Record Date.

           We believe that as of the close of business on the Record Date, there
were ___ shares of common stock of Dexter issued and outstanding and entitled to
vote. Shareholders will have one vote for each share of common stock they own
with respect to all matters to be considered at the 2000 Annual Meeting.

           In order for your views on the above-described proposals to be
represented at the 2000 Annual Meeting, please sign and date the enclosed GOLD
proxy card and return it to Innisfree M&A Incorporated in the enclosed prepaid
envelope TODAY. Execution of the GOLD proxy card will not affect your right to
attend the 2000 Annual Meeting and to vote in person. Any proxy may be revoked
at any time prior to the 2000 Annual Meeting by delivering a written notice of
revocation or a later dated proxy for the 2000 Annual Meeting to Innisfree M&A
Incorporated or the Secretary of Dexter, or by voting in person at the 2000
Annual Meeting. ONLY YOUR LATEST DATED PROXY WILL COUNT.

           Unless otherwise indicated, the GOLD Proxy authorizes the persons
named in the proxy to vote, and such persons will vote, properly executed and
duly returned proxies FOR the Nominee Election Proposals, FOR the Shareholder
Rights


                                       31
<PAGE>

Proposals and FOR the Voting Rights Proposals, all of which are described in
this proxy statement. If no marking is made on your GOLD Proxy with respect to
the ratification of the appointment of Dexter's independent auditors, you will
be deemed to have given a direction to abstain from voting on such matter.

                                  VOTE REQUIRED

           Based on currently available public information, a quorum will exist
at the 2000 Annual Meeting if holders of not less than a majority of the shares
of Dexter common stock outstanding and entitled to vote at the 2000 Annual
Meeting are present in person or by proxy. If a quorum is present, our proposals
can be adopted by the following vote:

o          NOMINEE PROPOSALS: Election of nominees for directorships will
           require the affirmative vote of a plurality of the votes cast.
           Consequently, only shares that are voted in favor of a particular
           nominee will be counted toward such nominee's attaining a plurality
           of votes. The election of our nominees for the seven newly-created
           directorships will not be effective unless our Board Size Bylaw
           Proposal is adopted.

o          PROPOSALS REQUIRING BYLAW AMENDMENTS: We believe that our proposals
           involving amendments to the Dexter Bylaws, namely our Board Size
           Bylaw Proposal, Poison Pill Bylaw Proposal and Bylaw Repeal Proposal,
           will be approved if the votes cast for the respective proposal exceed
           the votes cast against the respective proposal. We have received the
           opinion of Levett Rockwood P.C., our Connecticut counsel, that, to
           the extent the Dexter Bylaws may require a supermajority shareholder
           vote for an amendment, such provision is invalid under Connecticut
           law. We have also instituted litigation seeking to have any such
           supermajority amendment requirement held ineffective. See "Certain
           Litigation." If the Dexter Bylaws are held to contain an effective
           supermajority provision, our Board Size Bylaw Proposal, Poison Pill
           Bylaw Proposal and Bylaw Repeal Proposal would each require the
           affirmative vote of the holders of two-thirds of the issued and
           outstanding shares of common stock

o          PROPOSALS NOT REQUIRING BYLAW AMENDMENTS: Adoption of our Poison Pill
           Amendment Proposal and Omnibus Proposal will be approved if the votes
           cast for the respective proposal exceed the votes cast against the
           respective proposal at the 2000 Annual Meeting. Our Poison Pill
           Amendment Proposal will not be effective unless our Poison Pill Bylaw
           Proposal is adopted.

                         WE STRONGLY RECOMMEND THAT YOU
                VOTE IN FAVOR OF EACH OF THE PROPOSALS DESCRIBED
                            IN THIS PROXY STATEMENT.



                                       32
<PAGE>


                            METHOD OF COUNTING VOTES

           The holders of not less than a majority of the number of shares of
Dexter common stock outstanding and entitled to vote at the 2000 Annual Meeting
must be represented in person or by proxy in order to constitute a quorum for
the transaction of business. Abstentions will be included for purposes of
determining whether a quorum exists, but broker non-votes will not. After a
quorum is determined to exist at the 2000 Annual Meeting, abstentions or broker
non-votes with respect to particular proposals brought to a vote or nominees
proposed for election will have no effect on the outcome of the vote on such
proposal or election. Broker non-votes occur when brokers do not receive voting
instructions from their customers on non-routine matters and consequently have
no discretion to vote on those matters. Accordingly, if your Dexter shares are
held in the name of a brokerage firm, bank nominee or other institution, you
should contact the person responsible for your account and give instructions for
a proxy card to be issued so that your shares will be represented at the 2000
Annual Meeting.

                             ADDITIONAL INFORMATION

           The principal executive offices of Dexter Corporation are at One Elm
Street, Windsor Locks, Connecticut 06096-2334. Dexter is a global specialty
materials supplier, principally serving the worldwide aerospace, electronics,
food packaging and medical markets. Except as otherwise noted herein, the
information concerning Dexter has been taken from or is based upon documents and
records on file with the SEC and other publicly available information. Although
we do not have any knowledge that would indicate that any statement contained
herein based upon such documents and records is untrue, we do not take any
responsibility for the accuracy or completeness of the information contained in
such documents and records, or for any failure by Dexter to disclose events that
may affect the significance or accuracy of such information.

           The principal executive offices of ISP are at 300 Delaware Avenue,
Wilmington, Delaware 19801. We are a leading manufacturer of specialty chemicals
and mineral products.

           We are subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and, in accordance with
the Exchange Act, file reports, proxy statements and other documents with the
SEC relating to our business, financial condition and other matters. These
reports, proxy statements and other documents can be inspected and copied at the
public reference facilities of the SEC at 450 Fifth Street, N.W., Washington, DC
20549, and at the regional offices of the SEC located at Seven World Trade
Center, 13th Floor, New York, New York 10048 and Citicorp Center, 500 West
Madison Street, Suite 1400, Chicago, Illinois 60661. Copies of ISP's filings
with the SEC can also be obtained by mail for a fee by writing to the SEC's
principal office at 450 Fifth Street, N.W., Washington, DC 20549. You can also
get electronic copies of our filings with the SEC for free on the SEC's Internet
web site at http://www.sec.gov. Copies of our filings with the SEC are also be
available for inspection at the offices of the New York Stock Exchange, 20 Broad
Street, New York, New York 10005.


                                       33
<PAGE>


                          PROXY SOLICITATION; EXPENSES

           This proxy statement and the accompanying GOLD Proxy Card are first
being furnished to shareholders on or about [____________]. Executed proxies may
be solicited in person, by mail, advertisement, telephone, telecopier, telegraph
or similar means. Solicitation may be made by directors, officers, investor
relations personnel and other employees of ISP and their affiliates, none of
whom will receive additional compensation for such solicitation. Proxies will be
solicited from individuals, brokers, banks, bank nominees and other
institutional holders. We have requested banks, brokerage houses and other
custodians, nominees and fiduciaries to forward all solicitation materials to
the beneficial owners of the shares they hold of record. We will reimburse these
record holders for their reasonable out-of-pocket expenses.

           In addition, ISP has retained Innisfree M&A Incorporated to provide
consulting and analytic services in connection with any proposal by us to
acquire Dexter in opposition to Dexter's Board. Among other things, Innisfree
has agreed to solicit proxies on our behalf in connection with the 2000 Annual
Meeting. Innisfree will employ approximately 75 people in its efforts. We have
agreed to reimburse Innisfree for its reasonable expenses and to pay to
Innisfree fees not to exceed $130,000.

           Chase Securities, Inc. is acting as our financial advisor in
connection with any proposed business combination transaction involving Dexter,
and is assisting us in connection with the financing of any such transaction.
For such services, Chase Securities will receive from ISP customary compensation
and reimbursement of its reasonable and documented expenses. In addition, ISP
has agreed to indemnify Chase Securities and related persons against certain
liabilities arising out of the engagement. In its capacity as our financial
advisor, Chase Securities has agreed, among other things, to assist us at our
request in contacting (in person, by telephone or otherwise) shareholders of
Dexter identified to Chase Securities by us and in soliciting their proxies in
favor of such a transaction on our behalf. Chase Securities will not receive any
separate or additional fee for, or in connection with, any such solicitation
activities. Chase Securities and its affiliates are engaged in providing a full
range of banking, securities trading, market making and brokerage services to
institutional and individual clients. In the normal course of its business Chase
Securities and its affiliates may have provided, and may in the future provide,
subject to certain contractual and conflict of interest limitations, financial
advisory, investment banking or other such services to Dexter, ISP or their
respective affiliates, and may trade securities of Dexter, ISP or their
respective affiliates for its own account and the accounts of its customers and,
accordingly, may at any time hold a long or short position in such securities.

           The entire expense of our proxy solicitation is being borne by ISP.
In the event that our nominees are elected to the Board, we may seek
reimbursement of such expenses from Dexter. In addition to the engagement of
Innisfree and Chase Securities described above, costs related to the
solicitation of proxies include expenditures for printing, postage, legal and
related expenses and are expected to be approximately $___. Total payment of
costs to date in furtherance of our proxy solicitation is approximately $___.


                                       34
<PAGE>


                 CERTAIN INFORMATION CONCERNING THE PARTICIPANTS

           ISP, ISP Investments, and certain of their affiliates, as well as our
nominees for directorships, may be deemed to be "participants" (as defined in
Instruction 3 to Item 4 of Rule 14a-101 of the Exchange Act) in this proxy
solicitation. Information relating to the beneficial ownership of common stock
of Dexter by the participants in this solicitation and certain other information
relating to the participants is contained in Annex VII to this proxy statement
and is incorporated in this proxy statement by reference. In addition, see
"Certain Litigation" for a description of legal proceedings in which the
participants in this solicitation have a material interest adverse to Dexter.
None of the participants in this solicitation are party to any commercial
dealings with Dexter or its subsidiaries required to be discussed pursuant to
Schedule 14A promulgated under the Exchange Act, which governs the disclosure
contained in this proxy statement. As described below under "Certain Interests
in the Proposals and with Respect to Securities of Dexter", ISP and its
affiliates beneficially own shares of Life Technologies, Dexter's majority owned
subsidiary. We have no knowledge of any commercial dealings between Life
Technologies and Dexter, other than information that may be disclosed in the
public filings of Life Technologies and Dexter.








                                       35
<PAGE>


                     CERTAIN INTERESTS IN THE PROPOSALS AND
                      WITH RESPECT TO SECURITIES OF DEXTER

           To the knowledge of ISP, there are no contracts, arrangements,
understandings or relationships (legal or otherwise) among ISP or its associates
with respect to any securities of Dexter.

           On November 25, 1998, ISP entered into an agreement (the "Group
Agreement") with certain other persons with respect to such parties' ownership
of common stock of Life Technologies, a majority owned subsidiary of Dexter.
Pursuant to the terms of the Group Agreement, ISP and the other parties thereto
agreed (i) not to sell or otherwise dispose of any shares of Life Technologies
common stock unless all of the parties mutually agreed (subject to certain
exceptions), (ii) to bear its own costs and expenses incurred in connection with
its ownership of Life Technologies shares, the Group Agreement or any
transactions entered into pursuant to the Group Agreement (subject to certain
exceptions for expenses incurred for the benefit of all the parties thereto),
(iii) to join with ISP in a Schedule 13D filing and any required amendments
thereto and (iv) not to enter into any other contract, arrangement,
understanding or relationship with any other person with respect to the equity
securities of Life Technologies. The initial Group Agreement provided for a term
of six months, but subsequent agreements were entered into ultimately extending
the term through September 30, 2000 for all but one of the original members of
the group. As of January 27, 2000, ISP owned beneficially 3,506,270 Life
Technologies shares which represented approximately 14.05% of the outstanding
shares of common stock of Life Technologies. As of such date, the continuing
parties to the Group Agreement (including ISP) beneficially owned, in the
aggregate, 5,417,991 Life Technologies shares, representing approximately 21.7%
of the outstanding shares of common stock of Life Technologies.

           Each of our nominees (other than Messrs. Heyman and Kumar) will
receive a stipend of $50,000 from ISP for his service as a nominee. This stipend
is not refundable in any manner in connection with the outcome of our proxy
solicitation or otherwise. The Nominees are each party to an indemnity agreement
with ISP (the "Director Indemnity Agreements"). In accordance with the terms of
the Director Indemnity Agreements, ISP has agreed to indemnify and hold harmless
each of the nominees from and against, among other things, all expenses,
liabilities and losses, including reasonable attorney's fees, related to any
action, suit or proceeding to which such nominee is made a party or threatened
to be made a party by reason of such nominee's action or inaction while serving
as a nominee.




                                       36
<PAGE>


                         SECURITY OWNERSHIP OF DIRECTORS
                            AND MANAGEMENT OF DEXTER

           The following table presents, as of March 9, 1999, based solely on
information contained in the Dexter's 1999 Proxy Statement, the common stock
beneficially owned (as that term is defined by the SEC) by all directors,
nominees and named executive officers of the Dexter, and the directors, nominees
and executive officers of the Dexter as a group. This beneficially owned common
stock includes shares of common stock which they had a right to acquire within
60 days of such date by the exercise of options granted under the Dexter's stock
option plans.

           Except as otherwise noted in a footnote below, each director, nominee
and executive officer has sole voting and investment power with respect to the
number of shares of common stock set forth opposite his or her name in the
table.

<TABLE>
<CAPTION>

                                                                              SHARES OF                   PERCENTAGE OF
                                                                             COMMON STOCK                    COMMON
                                                                             BENEFICIALLY                     STOCK
SHAREHOLDERS                                                                   OWNED(1)                  OUTSTANDING(1)
- ------------                                                                   --------                  --------------
<S>                                                                              <C>
K. Grahame Walker..............................................                  196,675                          *
Kathleen Burdett...............................................                   49,522                          *
Jeffrey W. McClelland..........................................                   18,721                          *
R. Barry Gettins...............................................                   54,036                          *
David G. Gordon................................................                   26,500                          *
Charles H. Curl................................................                    3,143                          *
Henrietta Holsman Fore.........................................                    3,690                          *
Bernard Fox....................................................                    3,928                          *
Robert M. Furek................................................                    3,536                          *
Martha Clark Goss..............................................                    3,625                          *
Edgar G. Hotard................................................                    2,211                          *
Peter G. Kelly.................................................                    6,036                          *
Jean-Francois Saglio...........................................                    2,541                          *
George M. Whitesides...........................................                    3,743                          *
All Directors, Nominees and Executive Officers as a Group (22
persons).......................................................                  568,872                          2.4

</TABLE>

- ----------
(1) The shares reported above as beneficially owned by the following persons
    include vested stock options granted under the Dexter's stock option plans.
    The shares reported above also include shares of restricted stock issued to
    the following persons pursuant to the 1994 Long Term Incentive Plan (the
    "1994 Plan"): K. Grahame Walker - 44,334: Kathleen Burdett - 19,142; Jeffrey
    W. McClelland - 6,236: R. Barry Gettins - 11,584; David G. Gordon - 10,000;
    and "All Directors, Nominees and Executive Officers as a Group" 168,310.
    Shares of restricted stock issued pursuant to the 1994 Plan are subject to
    forfeiture, but may be voted by the holders thereof unless and until
    forfeited. Percentages of common stock of less than 1% are indicated by an
    asterisk.


                                       37
<PAGE>


                        PRINCIPAL SHAREHOLDERS OF DEXTER

           The following table sets forth, based solely, except as otherwise
described herein, on information contained in the Dexter's 1999 Proxy Statement,
the number and percentage of outstanding shares of common stock beneficially
owned by each person known to ISP (other than ISP) as of such date to be the
beneficial owner of more than five percent of the outstanding shares of common
stock. The information with respect to ISP has been provided by the members
thereof as of ____ __, 2000.


<TABLE>
<CAPTION>

                                                                              SHARES OF                   PERCENTAGE OF
                                                                             COMMON STOCK                    COMMON
                                                                             BENEFICIALLY                     STOCK
SHAREHOLDERS                                                                    OWNED                      OUTSTANDING
- ------------                                                                    -----                      -----------
<S>                                                                            <C>                          <C>

ISP
ISP Investments Inc.
ISP Opco Holdings Inc.
c/o ISP Management Company, Inc.
1361 Alps Road, Wayne, New Jersey 07470........................                2,299,200                    9.98(1)
FMR Corp., 82 Devonshire Street Boston, Massachusetts 02109
(Fidelity Managed Funds).......................................                2,290,600                    9.8(2)
Mary K Coffin, c/o Dexter Corporation, One Elm Street, Windsor
Locks, Connecticut 06096.......................................                1,300,000                    5.6(3)
</TABLE>


(1)    ISP Investments Inc. (through ISP Investments Grantor Trust) has the sole
       power to vote, direct the voting of, dispose of and direct the
       disposition of the shares. ISP Opco Holdings Inc., by virtue of its
       indirect ownership of all of the outstanding capital stock of ISP
       Investments Inc., may be deemed to own beneficially (solely for purposes
       of Rule 13d-3) the shares. ISP, by virtue of its ownership of all of the
       outstanding common stock of ISP Opco Holdings Inc., may be deemed to own
       beneficially (solely for purposes of Rule 13d-3) the shares. Samuel J.
       Heyman, by virtue of his beneficial ownership (as defined in Rule 13d-3)
       of approximately 76% of the capital stock of ISP, may be deemed to own
       beneficially (solely for purposes of Rule 13d-3) the shares.

(2)    Share holdings as of December 31, 1998, as reported on the Schedule 13G
       most recently filed by such shareholder.

(3)    Of the 1,300,000 shares shown in the table as owned by Mary K. Coffin,
       1,000,000 are held by Fleet Bank, N.A., trustee of a trust the
       beneficiary of which is Dexter D. Coffin, Jr. Mary K Coffin is a trustee
       of this trust and shares the power to vote and dispose of shares owned by
       the trust. The power to vote and dispose of the shares owned by this
       trust is held by a majority of its three individual trustees. The
       remaining shares show in the table are held by Mary K. Coffin through a
       living trust.


                                       38
<PAGE>

               SHAREHOLDERS' PROPOSALS IN DEXTER'S PROXY STATEMENT

       The Dexter's Bylaws require that notice of nominations to the Board of
Directors proposed by shareholders be received by the Secretary of the Dexter,
along with certain other specified material, not less than 75 nor more than 125
days prior to the first anniversary of the prior year's annual meeting;
provided, however, that in the event that the date of the annual meeting is
advanced by more than seventy five days from such anniversary date, notice by
the shareholder to be timely must be so delivered not later than the fifteenth
day following the day on which public announcement of the date of such meeting
is first made. Any shareholder who wishes to nominate a candidate for election
to the Board should obtain a copy of the relevant section of the Bylaws from the
Secretary of the Dexter.

       Pursuant to Rule 14a-8(e)(2) under the Exchange Act, any proposal by a
shareholder at the 2000 Annual Meeting, to be included in the Dexter's proxy
statement, must be received in writing at the Dexter's principal executive
offices not less than 120 calendar days in advance of the date of the Dexter's
proxy statement was released to security holders in connection with its 1999
Annual Meeting of Shareholders. However, if the date of the meeting is changed
by more than 30 days from the date of the previous year's meeting, then the
deadline is a reasonable time before the Dexter begins to print and mail its
proxy materials.

       Proposals should be addressed to the Corporate Secretary, Dexter
Corporation, One Elm Street, Windsor Locks, Connecticut 06096.

WE URGE YOU TO SIGN, DATE AND RETURN THE GOLD PROXY CARD IN FAVOR OF THE
ELECTION OF OUR NOMINEES AND THE ADOPTION OF THE PROPOSALS DESCRIBED IN THIS
PROXY STATEMENT.

Dated:     __________ __, 2000

                                      Sincerely,

                                      Your Fellow Shareholders:

                                      INTERNATIONAL SPECIALTY PRODUCTS INC.

                                      ISP INVESTMENTS INC.





                                       39
<PAGE>


                                                                         ANNEX I


                            BOARD SIZE BYLAW PROPOSAL


           RESOLVED, that the Bylaws of Dexter Corporation be, and they hereby
are, amended, effective at the time this resolution is approved by the
shareholders of Dexter Corporation, by:

       (i)    deleting the fourth sentence of Article III, Section 1, which
              reads "[e]ach class of directorships shall consist of not less
              than one nor more than five directorships", in its entirety;

       (ii)   adding a new fourth sentence of Article III, Section 1 as follows:

              "At the annual meeting of the shareholders of the corporation held
              in 2000, additional directors shall be elected so that the Board
              of Directors shall consist of seventeen directorships. The
              additional directorships thereby created shall be allocated to the
              classes with terms expiring at the annual meeting of the
              shareholders of the corporation to be held in 2001 or 2002, unless
              otherwise allocated by the Board of Directors consistent with
              Section 33-740 of the Connecticut Business Corporation Act"; and

       (iii)  adding a new final sentence of Article III, Section 1 as follows:

              "The fourth sentence of this Section 1 may be altered, amended or
              repealed only with the approval of the shareholders of the
              corporation entitled to vote thereon in the manner set forth in
              Section 33-709(c) of the Connecticut Business Corporation Act."



                                       A-1
<PAGE>

                                                                        ANNEX II


                   THE ADDITIONAL DIRECTORS ELECTION PROPOSAL

           RESOLVED, that each of the following persons be elected a director of
Dexter Corporation to fill the new directorships on the Board of Directors of
Dexter Corporation resulting from the adoption of the resolution amending
Article III, Section 1 of the Bylaws to increase the size of the Board, for a
term commencing at the time this resolution is adopted by the shareholders of
Dexter Corporation and shall be allocated into classes with terms continuing
until the annual meeting of the shareholders of Dexter Corporation to be held in
the year indicated below, and until the election and qualification of his
respective successor or until his earlier resignation or removal:



Alan Meckler                                2002
Dan Ogden                                   2002
Morrison DeSoto Webb                        2002
Robert Englander                            2002
John Droney                                 2001
Anthony T. Kronman                          2001
Vincent Tese                                2001


; provided, that the Board of Directors may instead allocate certain of such
directorships to a different class, consistent with Section 33-740 of the
Connecticut Business Corporation Act.

                                      A-2
<PAGE>


                                                                       ANNEX III


                         THE POISON PILL BYLAW PROPOSAL

           RESOLVED, that the Bylaws of Dexter Corporation be, and they hereby
are, amended, effective at the time this resolution is approved by the
shareholders of Dexter Corporation, by adding the following Section 7 to the end
of Article II:

           "Section 7. Rights Agreements.

                      The Board of Directors, in exercising its rights and
           duties with respect to the administration of the Rights Agreement,
           dated as of August 23, 1996, as amended, by and between the
           corporation and Chase Mellon Shareholder Services L.L.C., as Rights
           Agent (the "Rights Agreement") will carry out a resolution
           authorizing (i) the partial or complete redemption of the rights
           issued pursuant to the Rights Agreement (the "Rights"), or (ii) an
           amendment to the Rights Agreement making the Rights inapplicable to
           offers or transactions or types of offers or transactions specified
           in such resolution, if such resolution is authorized and approved by
           the shareholders of the corporation entitled to vote thereon in the
           manner set forth in Section 33-709(c) of the Connecticut Business
           Corporation Act. In addition, the Board of Directors shall not adopt
           any new shareholder rights plan, rights agreement or any other form
           of "poison pill" which is designed to or has the effect of making
           acquisitions of large holdings of the corporation's shares of stock
           more difficult or expensive, unless such plan is first approved by
           the shareholders of the corporation entitled to vote thereon in the
           manner set forth in Section 33-709(c) of the Connecticut Business
           Corporation Act. This Section 7 may be altered, amended or repealed
           only with the approval of the shareholders of the corporation
           entitled to vote thereon in the manner set forth in Section 33-709(c)
           of the Connecticut Business Corporation Act."


                                      A-3
<PAGE>


                                                                        ANNEX IV


                       THE POISON PILL AMENDMENT PROPOSAL

           RESOLVED, that the shareholders of Dexter Corporation hereby exercise
their right under Article II, Section 7 of the Bylaws of Dexter Corporation, as
amended on the date hereof, to require the Board of Directors to promptly amend
the Rights Agreement, dated as of August 23, 1996, as amended, by and between
Dexter Corporation and ChaseMellon Shareholder Services, L.L.C. (the "Rights
Agreement") to provide that the acquisition of beneficial ownership of shares of
common stock, par value $1.00 per share, of Dexter Corporation ("Common Stock")
pursuant to any offer for all outstanding shares of Common Stock for
consideration of at least $45 per share net to the seller in cash shall
constitute a "Qualifying Offer" within the meaning of Sections 11(a)(ii) and
13(d) of the Rights Agreement.


                                      A-4
<PAGE>


                                                                         ANNEX V


                            THE BYLAW REPEAL PROPOSAL

           RESOLVED, that any and all amendments made by the Board of Directors
of Dexter Corporation to the Bylaws of Dexter Corporation on or after February
26, 1999, be, and the same hereby are, repealed, and that, without the approval
of the shareholders of Dexter Corporation, the Board of Directors may not
thereafter amend any section of the Bylaws affected by such repeal or adopt any
new Bylaw provision which serves to reinstate any repealed provisions or any
similar provisions.


                                      A-5
<PAGE>


                                                                        ANNEX VI


                              THE OMNIBUS PROPOSAL

           RESOLVED, that each of the proposals of International Specialty
Products Inc. and ISP Investments Inc. shall be voted upon by the shareholders
of Dexter Corporation at the 2000 Annual Meeting in the following order:


           1.        This Omnibus Proposal;

           2.        The Bylaw Repeal Proposal;

           3.        The Director Election Proposal;

           4.        The Board Size Bylaw Proposals;

           5.        The Additional Directors Election Proposal;

           6.        The Poison Pill Bylaw Proposal; and

           7.        The Poison Pill Amendment Proposal.


                                      A-6
<PAGE>



                                                                       ANNEX VII

                 INFORMATION CONCERNING INTERNATIONAL SPECIALTY
                      PRODUCTS INC. AND OTHER PARTICIPANTS
                               IN THE SOLICITATION

           Information is being given herein for (i) International Specialty
Products Inc., a Delaware corporation ("ISP"), (ii) ISP Investments Inc., a
Delaware corporation ("ISP Investments"), (iii) Samuel J. Heyman, a natural
person and nominee for the Board of Directors of the Company, (iv) Sunil Kumar,
a natural person and nominee for the Board of Directors of the Company, (v)
Philip Peller, a natural person and nominee for the Board of Directors of the
Company, (vi) Alan Meckler, a natural person and nominee for the Board of
Directors of the Company, (vii) Dan Ogden, a natural person and nominee for the
Board of Directors of the Company, (viii) Morrison DeSoto Webb, a natural person
and nominee for the Board of Directors of the Company, (ix) Robert Englander, a
natural person and nominee for the Board of Directors of the Company, (x) John
Droney, a natural person and nominee for the Board of Directors of the Company,
(xi) Anthony T. Kronman, a natural person and nominee for the Board of Directors
of the Company, and (xii) Vincent Tese, a natural person and nominee for the
Board of Directors of the Company, who are each a "participant in a
solicitation" as defined under the proxy rules (collectively, the
"Participants").

           Information is also given for each of the entities listed on Schedule
A to this Annex VII, each of which is an "associate", as defined under the proxy
rules, of the Proponents.

           Each of ISP and ISP Investments is a Delaware corporation. Each of
ISP and ISP Investments has its principal place of business at 300 Delaware
Avenue, Wilmington, Delaware 19801. The address of each of the entities listed
on Schedule A to this Annex VII is c/o ISP Management Company, Inc., 1361 Alps
Road, Wayne, New Jersey 07470.

           The Participants may be deemed to have beneficial ownership of the
Company's Common Stock and the common stock, par value $.01 per share ("LTI
Common Stock"), of Life Technologies, Inc. ("LTI") as set forth immediately
below. Except as set forth below, no associates of any of the Participants owns
any Common Stock or LTI Common Stock.


                                      A-7
<PAGE>

<TABLE>
<CAPTION>
                                                                                                               APPROXIMATE MARGIN
                                   NUMBER OF SHARES OF THE               NUMBER OF SHARES                   DEBTEDNESS WITH RESPECT
NAME                               COMPANY'S COMMON STOCK              OF LTI'S COMMON STOCK                    TO COMMON STOCK
- ----                               ----------------------              ---------------------                    ---------------
<S>                                 <C>                            <C>                                          <C>
ISP Investments Inc.                      2,299,200                            3,384,600                         (5)
                                    (direct ownership)(1)          (direct/indirect ownership)(2)(3)

ISP Opco Holdings Inc.                    2,299,200                            3,384,600                         (5)
                                   (indirect ownership)(1)            (indirect ownership)(2)(3)

ISP Ireland                                   0                                 452,000                          (5)
                                                                         (direct ownership)(3)

International Specialty                   2,299,200                            3,506,270                         (5)
Products Inc.                      (indirect ownership)(1)       (direct/indirect ownership)(2)(3)(4)

Samuel J. Heyman                          2,299,200                            3,506,270                         (5)
                                   (indirect ownership)(1)           (indirect ownership)(2)(3)(4)

Sunil Kumar                                   0                                      0                           $ 0

Philip Peller                                 0                                      0                           $ 0

Alan Meckler                                  0                                      0                           $ 0

Dan Ogden                                     0                                      0                           $ 0

Morrison DeSoto Webb                          0                                      0                           $ 0

Robert Englander                              0                                      0                           $ 0

John Droney                                   0                                      0                           $ 0

Anthony T. Kronman                            0                                      0                           $ 0

Vincent Tese                                  0                                      0                           $ 0

</TABLE>


                                     A-7-1
<PAGE>


(1)        ISP Investments (through ISP Investments Grantor Trust) has the sole
           power to vote, direct the voting of, dispose of and direct the
           disposition of the Common Stock. ISP Opco Holdings Inc. ("ISP Opco"),
           by virtue of its indirect ownership of all of the outstanding capital
           stock of ISP Investments, may be deemed to own beneficially (solely
           for purposes of Rule 13d-3) the Common Stock owned by ISP
           Investments. International Specialty Products Inc. ("ISP"), by virtue
           of its ownership of all of the outstanding common stock of ISP Opco,
           may be deemed to own beneficially (solely for purposes of Rule 13d-3)
           the Common Stock owned by ISP Investments. Mr. Heyman, by virtue of
           his beneficial ownership (as defined in Rule 13d-3) of approximately
           76% of the capital stock of ISP, may be deemed to own beneficially
           (solely for purposes of Rule 13d-3) the Common Stock owned by ISP
           Investments.

(2)        ISP Investments (directly and through ISP Investments Grantor Trust)
           has the sole power to vote, direct the voting of, dispose of and
           direct the disposition of 2,932,600 shares of LTI Common Stock. ISP
           Opco, by virtue of its indirect ownership of all of the outstanding
           capital stock of ISP Investments, may be deemed to own beneficially
           (solely for purposes of Rule 13d-3) all of the LTI Common Stock owned
           by ISP Investments. ISP, by virtue of its ownership of all of the
           outstanding common stock of ISP Opco, may be deemed to own
           beneficially (solely for purposes of Rule 13d-3) the LTI Common Stock
           owned by ISP Investments. Mr. Heyman, by virtue of his beneficial
           ownership (as defined in Rule 13d-3) of approximately 76% of the
           capital stock of ISP, may be deemed to own beneficially (solely for
           purposes of Rule 13d-3) the LTI Common Stock owned by ISP
           Investments.

(3)        ISP Ireland has the sole power to vote, direct the voting of, dispose
           of and direct the disposition of 452,000 shares of LTI Common Stock.
           ISP Investments, by virtue of its indirect ownership of all of the
           outstanding capital stock of ISP Ireland, may be deemed to own
           beneficially (solely for purposes of Rule 13d-3) all of the LTI
           Common Stock owned by ISP Ireland. ISP Opco, by virtue of its
           indirect ownership of all of the outstanding capital stock of ISP
           Investments, may be deemed to own beneficially (solely for purposes
           of Rule 13d-3) all of the LTI Common Stock owned by ISP Ireland. ISP,
           by virtue of its ownership of all of the outstanding common stock of
           ISP Opco, may be deemed to own beneficially (solely for purposes of
           Rule 13d-3) the LTI Common Stock owned by ISP Ireland. Mr. Heyman, by
           virtue of his beneficial ownership (as defined in Rule 13d-3) of
           approximately 76% of the capital stock of ISP, may be deemed to own
           beneficially (solely for purposes of Rule 13d-3) the LTI Common Stock
           owned by ISP Ireland.

(4)        ISP has the sole power to vote, direct the voting of, dispose of and
           direct the disposition of 121,670 shares of LTI Common Stock. Mr.
           Heyman, by virtue of his beneficial ownership (as defined in Rule
           13d-3) of approximately 76% of the capital stock of ISP, may be
           deemed to own beneficially (solely for purposes of Rule 13d-3) the
           LTI Common Stock owned by ISP.

(5)        In the ordinary course of its business, ISP Investments Inc.
           purchases securities for its investment portfolio with funds obtained
           from the working capital of ISP Investments, loans from affiliates
           and borrowings pursuant to standard margin arrangements.

           Other than as set forth immediately below, to the best of the
knowledge of the Participants and their associates, none has been, within the
past year, a party to any contract, arrangement or understanding with any person
with respect to any securities of the Company, including but not limited to
joint ventures, loan or option arrangements, puts or calls, guarantees against
loss or guarantees of profits, division of losses or profits, or the giving or
withholding of proxies:

                                     A-7-2
<PAGE>

           On November 25, 1998, ISP entered into an agreement (the "Group
Agreement") with certain other persons with respect to such parties' ownership
of LTI Common Stock. Pursuant to the terms of the Group Agreement, ISP and the
other parties thereto agreed (i) not to sell or otherwise dispose of any shares
of LTI Common Stock unless all of the parties mutually agreed (subject to
certain exceptions), (ii) to bear its own costs and expenses incurred in
connection with its ownership of LTI Common Stock, the Group Agreement or any
transactions entered into pursuant to the Group Agreement (subject to certain
exceptions for expenses incurred for the benefit of all the parties thereto),
(iii) to join with ISP in a Schedule 13D filing and any required amendments
thereto and (iv) not to enter into any other contract, arrangement,
understanding or relationship with any other person with respect to the equity
securities of LTI. The initial Group Agreement provided for a term of six
months, but subsequent agreements were entered into ultimately extending the
term through September 30, 2000 for all but one of the original members of the
group.

           No Participant or Associate owns any securities of the Company of
record but not beneficially.

           None of the Participants and none of their associates has any
arrangement or understanding with any person with respect to (i) any future
employment with the Company or (ii) any future transactions to which the Company
or any of its affiliates may be a party, except as set forth in the letter,
dated December 14, 1999, from Mr. Heyman to the Company's Chairman and Chief
Executive Officer, in which ISP proposed to purchase all of the Company's
outstanding Common Stock for $45 per share in a merger transaction, which
proposal was subsequently rejected by the Company's Board by correspondence
dated December 23, 1999. No family relationships exist among the Proponent's
Nominees or between any Company director or executive officer and any of the
Proponent's Nominees.

           The following is a summary of all transactions in Company securities
by the Participants over the last two years.

DATE OF TRANSACTION          NATURE OF TRANSACTION          NUMBER OF SHARES
- -------------------------------------------------------------------------------
   09/15/98                           Buy                       37,000
   09/17/98                           Buy                      440,000
   09/21/98                           Buy                       64,700
   09/23/98                           Buy                        5,400
   09/25/98                           Buy                       10,000
   09/30/98                           Buy                       10,600
   10/01/98                           Buy                          100
   10/02/98                           Buy                       25,000
   10/05/98                           Buy                          600
   10/06/98                           Buy                       14,200
   10/07/98                           Buy                       18,400
   10/09/98                           Buy                       55,500

                                     A-7-3
<PAGE>

   10/16/98                           Buy                      169,100
   10/19/98                           Buy                       75,000
   11/11/98                           Buy                       47,500
   11/12/98                           Buy                       69,600
   12/01/98                           Sell                    (50,000)
   12/02/98                           Sell                    (25,000)
   12/04/98                           Buy                      106,500
   12/09/98                           Buy                       11,600
   12/10/98                           Buy                       15,600
   12/11/98                           Buy                       18,500
   12/14/98                           Buy                       14,000
   12/15/98                           Buy                        6,000
   02/17/99                           Buy                        5,000
   03/31/99                           Buy                        7,500
   05/07/99                           Sell                    (25,000)
   05/13/99                           Buy                       10,000
   05/14/99                           Buy                       20,000
   05/17/99                           Buy                       17,100
   05/18/99                           Buy                       21,600
   05/19/99                           Buy                        2,500
   05/21/99                           Buy                       10,000
   05/24/99                           Buy                       11,400
   05/25/99                           Buy                       20,500
   05/26/99                           Buy                       20,000
   05/27/99                           Buy                       19,000
   05/28/99                           Buy                        2,000
   06/01/99                           Buy                       19,000
   06/02/99                           Buy                       22,500
   06/03/99                           Buy                        6,200
   06/07/99                           Buy                        5,500
   06/08/99                           Buy                        1,900
   06/09/99                           Buy                       31,500
   06/10/99                           Buy                        1,300
   06/15/99                           Buy                       10,000
   06/24/99                           Sell                    (25,000)
   07/13/99                           Sell                     (2,900)
   07/22/99                           Buy                        9,600
   07/23/99                           Buy                        5,000
   07/26/99                           Buy                        4,700
   07/28/99                           Buy                        7,700
   08/03/99                           Sell                     (6,300)
   08/05/99                           Buy                        3,500
   08/06/99                           Sell                     (3,500)
   08/09/99                           Buy                      248,400
   08/10/99                           Buy                       11,400

                                     A-7-4
<PAGE>

   08/11/99                           Buy                       12,700
   08/19/99                           Sell                     (5,300)
   08/20/99                           Buy                       56,000
   08/23/99                           Buy                       94,900
   08/24/99                           Buy                       28,900
   08/25/99                           Buy                       12,300
   08/27/99                           Buy                       12,000
   08/30/99                           Buy                       13,000
   08/31/99                           Buy                        7,500
   09/03/99                           Buy                       84,300
   09/07/99                           Buy                       48,600
   09/08/99                           Buy                        9,900
   09/13/99                           Sell                     (1,000)
   09/14/99                           Sell                     (1,400)
   09/15/99                           Sell                     (2,000)
   09/17/99                           Buy                       46,300
   09/20/99                           Buy                       76,000
   09/21/99                           Buy                       31,400
   09/22/99                           Buy                       15,000
   09/23/99                           Buy                       34,000
   09/24/99                           Buy                       47,600
   09/27/99                           Buy                       46,500
                                                      -----------------
                                                             2,299,200
                                                      =================


                                     A-7-5
<PAGE>


                                                         SCHEDULE A TO ANNEX VII


               Associates of International Specialty Products Inc.
               ---------------------------------------------------


ISP Opco Holdings Inc.
Belleville Realty Corp.
ISP Alginates Inc.
ISP Management Company, Inc.
ISP Chemicals Inc.
ISP Minerals Inc.
ISP Technologies Inc.
ISP Mineral Products Inc.
ISP Environmental Services Inc.
Bluehall Incorporated
ISP Realty Corporation
ISP Real Estate Company, Inc.
International Specialty Products Funding Corporation
ISP Newark Inc.
ISP Van Dyk Inc.
ISP Fine Chemicals Inc.
ISP Freetown Fine Chemicals Inc.
Verona Inc.
ISP Global Technologies Inc.
ISP International Corp.
ISP Marl Holdings Gmbh
ISP Holdings (U.K.) Ltd.
ISP Ireland
ISP (Puerto Rico) Inc.
ISP Marl Gmbh
ISP Acetylene Gmbh
ISP Alginates (U.K.) Ltd.
ISP (Great Britain) Co. Ltd.
ISP Andina, C.A.
ISP Argentina S.A.
ISP Asia Pacific Pte Ltd.
ISP (Australasia) Pte Ltd.
ISP (Belgium) N.V.
ISP (Belgium) International N.V.
ISP do Brasil Ltda.
ISP (Canada) Inc.
ISP Ceska Republika Spol S.R.O.
ISP (China) Limited
ISP Colombia Ltda.
ISP Freight Service N.V.

                                     A-7-6
<PAGE>

ISP Global Operations (Barbados) Inc.
ISP Global Technologies (Belgium) S.A.
ISP Global Technologies (Germany) Holding Gmbh
ISP Customer Service Gmbh
ISP Global Technologies Deutschland Gmbh
International Specialty Products ISP (France) S.A.
ISP (Hong Kong) Limited
ISP (Italia) S.r.l.
ISP (Japan) Ltd.
ISP (Korea) Limited
ISP Mexico, S.A. de C.V.
ISP (Norden) A.B.
ISP (Osterreich) G.m.b.h.
ISP (Polska) Sp.z. o.p.
ISP Sales (Barbados) Inc.
ISP Sales (U.K.) Limited
ISP (Singapore) Pte Ltd.
ISP (Switzerland) A.G.
ISP (Thailand) Co., Ltd.
Chemfields Pharmaceuticals Private Limited




                                     A-7-7
<PAGE>


                               [PRELIMINARY COPY]

PROXY

                               DEXTER CORPORATION

              PROXY SOLICITED ON BEHALF OF INTERNATIONAL SPECIALTY
PRODUCTS INC., ISP INVESTMENTS INC. AND THE OTHER PARTICIPANTS IDENTIFIED IN THE
        PROXY STATEMENT FURNISHED HEREWITH ("ISP") FOR THE ANNUAL MEETING
                    OF SHAREHOLDERS, _____ __, 2000 AT ___ .

The undersigned shareholder of Dexter Corporation ("Dexter") hereby appoints
____________ and ______________ and each of them, as attorneys and proxies, each
with power of substitution and revocation, to represent the undersigned at the
Annual Meeting of Shareholders of Dexter Corporation to be held at
________________, _______________, __________ on ______ __, 2000 at _____, local
time, and at any adjournment or postponement thereof, with authority to vote all
shares held or owned by the undersigned in accordance with the directions
indicated herein.

           Receipt of the Proxy Statement furnished herewith is hereby
acknowledged.

           THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER
DIRECTED BY THE UNDERSIGNED SHAREHOLDER. ON MATTERS FOR WHICH YOU DO NOT SPECIFY
A CHOICE, YOUR SHARES WILL BE VOTED IN ACCORDANCE WITH THE RECOMMENDATION OF
ISP.



                (CONTINUED AND TO BE SIGNED ON THE REVERSE SIDE)




<PAGE>


             ISP RECOMMENDS A VOTE "FOR" THE NOMINEES LISTED BELOW.

<TABLE>
<CAPTION>
<S>         <C>     <C>                         <C>         <C>                   <C>                   <C>               <C>
            1.       Election of Directors

FOR all nominees listed on the right (except    WITHHOLD AUTHORITY to vote for     NOMINEES: Samuel J. Heyman, Sunil
as marked to the contrary hereon).              all nominees listed to the         Kumar, Philip Peller (Instructions:
                                                right.                             To withhold authority to vote for
                                                                                   any individual nominee, write that
                                                                                   nominee's name in the space provided
                                                                                   below.)

                  [_]                                         [_]
                                                                                   ------------------------------------



                                                                  ISP RECOMMENDS A VOTE "FOR" PROPOSAL 2.

                                                                                       FOR              AGAINST           ABSTAIN
2.       THE BOARD SIZE BYLAW PROPOSAL                                                 [_]                [_]               [_]



                                                          ISP RECOMMENDS A VOTE "FOR" THE NOMINEES LISTED BELOW.


            3.       Election of ADDITIONAL Directors TO FILL VACANCIES FROM INCREASED BOARD SIZE

FOR all nominees listed on the right (except    WITHHOLD AUTHORITY to vote for   NOMINEES: Alan Meckler, Dan Ogden,
as marked to the contrary hereon).              all nominees listed to the       Morrison DeSoto Webb, Robert
                                                right.                           Englander, John Droney, Anthony T.
                                                                                 Kronman, Vincent Tese.
                                                                                 (Instructions: To withhold authority
                                                                                 to vote for any individual nominee,
                                                                                 write that nominee's name in the
                                                                                 space provided below.)

                  [_]                                         [_]
                                                                                 -----------------------------------




                                                           ISP RECOMMENDS A VOTE "FOR" PROPOSALS 4, 5, 6 and 7.

                                                                                       FOR              AGAINST            ABSTAIN
4.       THE POISON PILL RIGHTS PROPOSAL                                               [_]                [_]                [_]

                                                                                       FOR              AGAINST            ABSTAIN
5.       THE POISON PILL REDEMPTION PROPOSAL                                           [_]                [_]                [_]


                                                                                       FOR              AGAINST           ABSTAIN
6.       THE BYLAW REPEAL PROPOSAL                                                     [_]                [_]               [_]

                                                                                       FOR              AGAINST           ABSTAIN
7.       THE OMNIBUS PROPOSAL                                                          [_]                [_]               [_]


                         ISP MAKES NO RECOMMENDATION ON
                      THE FOLLOWING MATTERS TO BE VOTED ON
                           AT THE 2000 ANNUAL MEETING


<PAGE>


                                                                                       FOR              AGAINST           ABSTAIN
A.       RATIFICATION OF INDEPENDENT AUDITORS                                          [_]                [_]               [_]


IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON SUCH OTHER BUSINESS
AS MAY PROPERLY BE PRESENTED TO THE MEETING OR ANY ADJOURNMENT OR POSTPONEMENT
THEREOF.



P                                                               Dated: _____________, 2000


R                                                               ----------------------------------------
                                                                           (Signature)

O

                                                                ----------------------------------------
                                                                           (Signature if held jointly)
X

                                                                ----------------------------------------
                                                                Title:
Y

                                                                Please sign exactly as name appears hereon.
                                                                When shares are held by joint tenants, both
                                                                should sign. When signing as attorney,
                                                                executor, administrator, trustee, or guardian,
                                                                please give full title as such. If a
                                                                corporation, please sign in full corporate name
                                                                by president or other authorized officer. If a
                                                                partnership, please sign in partnership name by
                                                                authorized person.

</TABLE>



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