DEXTER CORP
PREC14A, 2000-03-03
PAINTS, VARNISHES, LACQUERS, ENAMELS & ALLIED PRODS
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                           PRELIMINARY PROXY STATEMENT

              AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION
                                ON MARCH 3, 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
- --------------------------------------------------------------------------------
                (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:\881389\07\$W3107!.DOC\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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                 PRELIMINARY PROXY MATERIALS DATED MARCH 3, 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 THE 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 the Shareholders of Dexter scheduled for 10:00
A.M., local time, on Thursday, April 27, 2000, at The Hartford Club, 46 Prospect
Street, Hartford, Connecticut 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 Dexter shareholders would receive at least $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 at that time was higher than the stock had ever traded
on the New York Stock Exchange ("NYSE"). Dexter's Board rejected our proposal
without negotiation. Soon thereafter, Dexter offered to purchase our shares of
Life Technologies, Inc., a majority-owned subsidiary of Dexter, which offer we
promptly rejected. We believe that Dexter made its offer in an attempt to deter
us from pursuing the ISP Proposal.

                     Following the public announcement of our proxy
solicitation, Dexter announced that it would allow us to review certain
non-public information concerning Dexter and Life Technologies to determine
whether we would be willing to increase our $45 per share proposal, but stated
that "we have made no decision to sell the Company and no one else will be
invited into the data room." Less than three weeks later, Dexter issued a press
release in which it announced that it would "institute a process in which we
will survey all of the Company's available options" and invite other parties
into the data room, but again emphasized that its Board "has made no decision to
sell the Company at this time."


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                     Unlike our nominees, Dexter's incumbent directors have not
committed to pursue the ISP Proposal or a superior proposal. We are now asking
you - the owners of the corporation - to elect our nominees and approve several
proposals intended to facilitate the ISP Proposal or a superior proposal. You
should note that there can be no assurance that the adoption of our proposals
will ensure the consummation of such a transaction.

OUR NOMINEE ELECTION PROPOSALS:

                     We are proposing to amend the Dexter Bylaws 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 pursue the ISP Proposal or
a superior proposal and, if elected, would constitute a majority of Dexter's
Board. Our nominees, if elected, and Dexter's incumbent directors, if
re-elected, would each owe the same fiduciary duties to Dexter shareholders.

OUR SHAREHOLDER RIGHTS PROPOSALS:

                     We believe that Dexter shareholders - the owners of the
corporation - should be permitted to consider the merits of any offer for their
shares. Accordingly, we are proposing that the Dexter Bylaws be amended to
require Dexter's Board to implement any special resolution passed by Dexter
shareholders directing Dexter's Board to redeem the rights issued under Dexter's
"poison pill" shareholder rights plan (the "Rights Agreement") or to amend the
Rights Agreement to render it inapplicable to types of offers or transactions
specified in any such resolution. Furthermore, in connection with this Bylaw
amendment, we seek your approval of a special resolution directing Dexter's
Board to amend the Rights Agreement promptly to make it inapplicable to any
offer to purchase all shares of Dexter for at least $45 per share in cash. The
Shareholder Rights Proposals, if adopted, will also allow the Dexter
shareholders to decide whether Dexter's Board can adopt any future "poison pill"
shareholder rights plans.

OUR VOTING RIGHTS PROPOSALS:

                     In order to minimize any attempt by Dexter's Board to
frustrate the consideration or implementation of our proposals, we are also
proposing to repeal any Bylaw amendments that may be unilaterally adopted by
Dexter's 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 MARCH __, 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 WHITE 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


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LATEST DATED PROXY IS THE ONLY ONE THAT COUNTS. 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 TO THE SECRETARY OF DEXTER, OR BY VOTING IN PERSON AT THE 2000
ANNUAL MEETING. SEE "VOTING PROCEDURES" ON PAGE 44.















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               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 own 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 own 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 49.

Q:      WHY ARE WE SOLICITING YOUR PROXY?

A:      As Dexter's largest shareholder and an investor in the company's shares
        since September 1998, we have been dissatisfied with Dexter's share
        price performance and the recent conduct of Dexter's Board described
        below. This has led us to engage in this proxy fight to protect the
        value of our and your investment in Dexter. Although subsequent to the
        public announcement of our $45 per share proposal and our proxy
        solicitation, Dexter's Board appears to have moderated somewhat its
        previous hard-line stance, Dexter's directors -- unlike our nominees --
        have not committed to pursue the ISP Proposal or a superior proposal.

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

         2.       On December 3, 1999, we discussed with Dexter's
                  representatives our view 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 it
                  would be in the best interests of both companies and their
                  respective shareholders if Dexter and Life Technologies were
                  independent corporate entities. Dexter rejected our
                  recommendation.

         3.       After Dexter dismissed our recommendation, we proposed a
                  business combination in which all holders of Dexter common
                  stock would receive at least $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 at that time was higher
                  than the stock had ever traded on the NYSE. Dexter's Board
                  rejected our proposal without negotiation. By not approving
                  the ISP Proposal, Dexter's Board has effectively deprived you


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                  of the right to consider for yourself whether or not to accept
                  our acquisition proposal. 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 (the "Rights")
                  which would be automatically triggered by a purchase of shares
                  under such an offer unless, under a recently-created exception
                  described below, Dexter's Board or its financial advisors take
                  action. 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.

         4.       On January 27, 2000, we informed Dexter that we believed that
                  the failure of Dexter's Board to encourage negotiation of the
                  ISP Proposal left us "with no choice but to take our proposal
                  directly to our fellow shareholders," and announced our
                  intention to present the proposals contained in this proxy
                  statement at the 2000 Annual Meeting.

         5.       Following the public announcement of the ISP Proposal and our
                  proxy solicitation, on February 9, 2000, Dexter's Board took
                  the following actions:

                  (a)      Dexter announced that it had amended its Rights
                           Agreement to make the poison pill Rights inapplicable
                           to any offer which is for all shares, is
                           substantially unconditional, remains available to
                           shareholders for 60 days, is supported by firm
                           financing commitments and is for a price which is, in
                           the opinion of Dexter's financial advisor, fair from
                           a financial point of view; and

                  (b)      Dexter announced that it would allow us to review
                           certain non-public information concerning Dexter and
                           Life Technologies to determine whether we would be
                           willing to increase our $45 per share proposal, but
                           stated, "we have made no decision to sell the company
                           or to explore a sale of the company or to test the
                           market ... and no one else will be invited into the
                           data room."

         6.       On February 28, 2000, Dexter announced that it would
                  "institute a process in which we will survey all of the
                  Company's available options" and invite other parties into the
                  data room. However, Dexter again emphasized that its Board
                  "has made no decision to sell the Company at this time." You
                  should know that Dexter has still refused to enter into
                  negotiations with us relating to the ISP Proposal.

        In short, we believe that the actions recently taken by Dexter's Board
        were taken only under the pressure of our proxy solicitation and
        underscore the urgent need for the adoption of our proposals. In our
        opinion, the changes to Dexter's poison pill are not satisfactory in
        that they still do not permit shareholder choice, but leave the decision
        as to whether shareholders should be permitted to consider an offer in
        the hands of Dexter's Board or its hand-picked financial advisors. In
        addition, Dexter's Board continues to state that the company is not for
        sale. We are seeking your proxy to vote in favor of the adoption of our


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        Nominee Election Proposals, Shareholder Rights Proposals and Voting
        Rights Proposals described in this document, because we believe that
        each of these proposals will facilitate the ISP Proposal or a superior
        proposal. If you grant us your proxy, we will also be entitled to vote
        your shares in our discretion on matters incident to the conduct of the
        2000 Annual Meeting and on other matters brought to a vote at the
        meeting for which we have not yet been given notice.

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 increasing the size of Dexter's
        Board so that you will have the opportunity to elect, as a majority of
        Dexter's Board of Directors, persons who are committed to pursue the ISP
        Proposal or a superior proposal. Dexter is currently proposing that only
        three of the ten current directors will stand for election at the 2000
        Annual Meeting. 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 Dexter shareholders at the 2000 Annual
        Meeting. If all of our nominees are elected, a majority of Dexter's
        directors would not be continuing incumbents and a lack of continuity in
        Dexter's corporate policy and governance may occur. However, our
        nominees, if elected, and Dexter's incumbent directors, if re-elected,
        would each owe the same fiduciary duties to Dexter shareholders.

Q:      WHO ARE THE NOMINEES?

A:      Our nominees include eight independent persons who are not affiliated
        with ISP and two persons who are affiliates of ISP, all of whom are
        well-respected members of the business and legal community. Our
        nominees, unlike Dexter's incumbent directors, are committed to pursue
        the ISP Proposal or a superior proposal. Two of our nominees, Samuel J.
        Heyman and Sunil Kumar, are affiliates of ISP. Mr. Heyman is the
        Chairman of the Board of ISP and Mr. Kumar is President and Chief
        Executive Officer of ISP. If elected to Dexter's Board, Messrs. Heyman
        and Kumar 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, and would act in accordance with
        their fiduciary duties to Dexter shareholders with respect to any action
        they do take as directors. We have no reason to believe that any of our
        nominees will be disqualified or unable or unwilling to serve if
        elected. However, if any of our nominees are unable to serve or for good
        cause will not serve, proxies may be voted for another person nominated
        by ISP to fill the vacancy.

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

A:      In 1996, Dexter's Board adopted the Rights Agreement, dated as of August
        23, 1996, by and between Dexter and ChaseMellon Shareholder Services,
        L.L.C. The poison pill Rights issued under the Rights Agreement permit
        Dexter shareholders to purchase shares of Dexter common stock, or shares
        of an acquiring company's common stock, at less than market prices, if,


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        among other things, persons not approved by Dexter's Board acquire
        beneficial ownership of 11% or more of Dexter's common stock, unless the
        offer falls within the recently-created exception requiring a fairness
        determination by Dexter's financial advisor. No action is required to
        trigger the exercisability of the Rights, once the threshold of
        ownership has been passed. Currently, any person or group who acquires
        beneficial ownership of 11% or more of Dexter's outstanding shares of
        common stock without Board approval or a fairness determination by
        Dexter's financial advisor and who cannot, like institutional investors
        and certain other parties, take advantage of an exception in the Rights
        Agreement applicable to "passive investors," will experience immediate
        and substantial economic and voting power dilution, because the poison
        pill rights issued to each other holder of Dexter common stock under the
        Rights Agreement would become automatically exercisable to purchase
        additional shares of common stock for each share then outstanding, at
        one-half the current market price, from and after the date of such
        threshold acquisition.

        In its current form, we believe that the Rights Agreement is harmful to
        your interests as a shareholder because it is a device that provides
        Dexter's Board with the power to block a transaction which could be
        economically beneficial to you, unless the offer falls within a limited,
        recently-created exception requiring, among other things a fairness
        determination by Dexter's financial advisors. Our proposed Bylaw
        amendment would require Dexter's Board to follow the direction of a
        majority of Dexter shareholders by redeeming the Rights or amending the
        Rights Agreement to render it inapplicable to types of offers or
        transactions specified by Dexter shareholders. In addition, Dexter's
        Board would be required to seek shareholder approval prior to adopting a
        new "poison pill" shareholder rights plan. As discussed below, we are
        also proposing that you direct Dexter's Board to amend the Rights
        Agreement now.

        Proponents of poison pills claim that plans such as the Rights Agreement
        provide boards of directors with time to respond to unsolicited bids in
        an orderly manner and provide incentives for a potential bidder to
        negotiate with the board, thereby potentially leading to a higher price
        for shareholders. If our Bylaw proposal and the shareholder resolution
        described below are adopted, the potential benefits of the Rights
        Agreement will no longer apply to any proposal for all shares for at
        least $45 in cash. However, we believe that you - the owners of the
        corporation - should be permitted to consider for yourself the merits of
        offers for your shares.

Q:      WHY DO WE WANT DEXTER'S 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 at least $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 at that time was higher than the
        stock had ever traded on the NYSE. Dexter's Board rejected our proposal
        without negotiation. Because Dexter's poison pill rights would be
        triggered by most acquisitions of 11% or more of Dexter's shares, it
        would be uneconomical for us or any third party to make an offer


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        directly to Dexter shareholders over the current Board's refusal, unless
        the offer falls within a limited, recently-created exception requiring,
        among other things, a fairness determination by Dexter's financial
        advisors. It should be noted that Dexter's Board has rejected our $45
        per share proposal as inadequate, and Dexter has not disclosed what
        price Dexter's financial advisors would deem fair.

        We believe that the shareholder resolution we propose, which would
        require Dexter's 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, would send a clear message to Dexter's
        Board that it should pursue offers of at least $45 per share and would
        end the uncertainty as to the minimum bid required to make the poison
        pill Rights inapplicable. However, you should be aware that adoption of
        the shareholder resolution would mean that any protection provided by
        the Rights Agreement would be inapplicable to any proposal to acquire
        all Dexter shares for at least $45 per share in cash.

Q:      WHAT WILL HAPPEN IF THE POISON PILL RIGHTS AGREEMENT IS INVALIDATED IN
        COURT?

A:      We have commenced litigation seeking to invalidate the Rights Agreement
        under Connecticut law. If the Rights Agreement is invalidated, it will
        no longer be an obstacle to stock accumulations or offers at any price
        and no longer would provide the protections referred to above, as
        advocated by poison pill proponents. If the Rights Agreement is
        judicially invalidated prior to the 2000 Annual Meeting, we will
        withdraw our Shareholder Rights Proposals.

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. A highly
        confident letter is not a binding commitment to provide funds. We have
        not yet sought a binding commitment (which would involve the payment of
        commitment fees) because our proposal has been rejected by Dexter's
        Board. However, we are confident, based on our discussions with Chase,
        that we could promptly obtain binding commitments if Dexter's Board
        accepts the ISP Proposal.

Q:      WHY ARE YOU PROPOSING TO REPEAL BYLAWS ADOPTED BY DEXTER'S BOARD?

A:      We propose to repeal any Bylaw amendments adopted by Dexter's 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 Dexter's Board prior to the
        2000 Annual Meeting are likely to be aimed at frustrating our proposals


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        and therefore are not likely to be in the best interests of the Dexter
        shareholders. Any Bylaw amendments validly adopted by Dexter's Board
        prior to the Annual Meeting would remain in effect unless and until our
        proposal to repeal such Bylaws is adopted. If Dexter's 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 February 25, 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 23,058,969 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, defined as 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:

        Nominee Proposals -- Election of our nominees 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. Accordingly, our Bylaw amendment proposals could be
        approved by less than a majority of the issued and outstanding shares of
        common stock once a quorum is present at the 2000 Annual Meeting. We
        have received the opinion of our Connecticut counsel, Levett Rockwood
        P.C., 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. Levett Rockwood P.C. has consented to the
        use of its name and the reference to its opinion in this Proxy
        Statement. 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 Dexter's 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. Accordingly,
        these proposals could be adopted by less than a majority of the issued


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        and outstanding shares of common stock once a quorum is present at the
        2000 Annual Meeting. 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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                                    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 WHITE proxy card to
         Dexter, you have every right to change your vote. Only your latest
         dated card will count. You may revoke any WHITE proxy card already sent
         to Dexter by signing, dating and mailing the enclosed GOLD Proxy Card
         in the postage-paid envelope provided. 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.

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
         WHITE proxy card unless you intend to change your vote, because only
         your latest dated proxy card will be counted.

                     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

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                          REASONS FOR THE SOLICITATION

                     The purpose of our proposals is to facilitate the ISP
Proposal or a superior proposal, in which you would receive at least $45 per
share in cash, although there can be no assurance that the adoption of our
proposals will result in the consummation of such a transaction. Our nominees to
Dexter's Board, unlike Dexter's incumbent directors, are committed to pursue the
ISP Proposal or a superior proposal. Another reason for our proposals is to
permit Dexter shareholders to consider, on their own, the merits of offers for
their shares by permitting them to issue instructions to Dexter's Board as to
the manner in which the Rights Agreement will be applied to particular offers.
In addition, we urge you to direct Dexter's Board now to make the Rights
Agreement inapplicable to offers of at least $45 per share in cash for all
shares.

                     As the largest Dexter shareholder and an investor in the
company's shares since September 1998, we have been dissatisfied with the share
price performance of Dexter's common stock. Specifically, on December 3, 1999,
we discussed with representatives of Dexter our view 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 it would be in the best interests of both companies and their
respective shareholders if Dexter and Life Technologies were independent
corporate entities. Dexter rejected our recommendation. Therefore, on December
14, 1999, we proposed to Dexter a business combination in which Dexter
shareholders would receive at least $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 at that time was higher than the stock had ever traded on the NYSE.
On December 23, 1999, Dexter's Board rejected our proposal without negotiation.
Then, on January 20, 2000, Dexter, in what we believe was an attempt to deter us
from pursuing the ISP Proposal, offered to purchase our shares of Life
Technologies for $49 per share, which offer we promptly rejected.

                     Following the public announcement of our proxy
solicitation, Dexter's Board announced that it would allow us to review certain
non-public information concerning Dexter and Life Technologies to determine
whether we would be willing to increase our $45 proposal. Dexter stated "[d]o
not misread the Board's decision or its intentions: we have made no decision to
sell the Company or to explore a sale of the Company or to test the market for a
possible sale of the Company, and no one else will be invited into the data
room." Less than three weeks later, Dexter announced that it would "institute a
process in which we will survey all of the Company's available options" and that
"third parties will be invited to sign confidentiality agreements, review
comprehensive data room materials and receive Dexter management presentations."
However, Dexter emphasized that its Board "has made no decision to sell the
Company at this time." We note that Dexter has not entered into negotiations
with us relating to the ISP Proposal.

                     Based on the statements and conduct of Dexter's Board
referred to above, we do not believe that the incumbent Dexter directors have
committed to pursue the ISP Proposal or a superior proposal. Our nominees,


                                       14
<PAGE>
unlike Dexter's incumbent directors, are committed to pursue the ISP Proposal or
a superior proposal. All determinations made by our nominees, if elected, as
well as those made by Dexter's incumbent directors, if re-elected, will be
subject to their fiduciary duties to Dexter shareholders. Two of our nominees,
Samuel J. Heyman and Sunil Kumar, are affiliated with 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, and would act in accordance with their fiduciary
duties to Dexter shareholders with respect to any action they do take as
directors.

                     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, refinance indebtedness of ISP and Dexter, pay anticipated
expenses and provide working capital for the combined companies following the
acquisition. A highly confident letter is not a binding commitment to provide
funds. We have not yet sought a binding commitment (which would involve the
payment of commitment fees) because our proposal has been rejected by Dexter's
Board. However, we are confident, based on our discussions with Chase, that we
could promptly obtain binding commitments if Dexter accepts our proposal. 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. While there is a lack of controlling case law in Connecticut to either
directly substantiate or directly contradict the validity of our proposals under
Connecticut state law, we believe, based on the case law of other jurisdictions
and our interpretation of the Connecticut Business Corporation Act and the
Dexter Certificate of Incorporation, that our proposals are valid. However, if
any of our proposals were to be finally adjudicated as invalid under Connecticut
law, such proposal, if adopted, would then not be effective. 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");


                                       15
<PAGE>
        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 Dexter's Board to make
                certain amendments to Dexter's "Poison Pill" Rights Agreement or
                redeem the Rights issued thereunder if Dexter shareholders
                instruct Dexter's 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 Dexter's Board of Directors to the Bylaws after February 26,
                1999 (the "Bylaw Repeal Proposal"); and

        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.
IF ANY PROPOSAL IS ADJUDGED INVALID UNDER CONNECTICUT LAW, IT WILL THEN NOT BE
EFFECTIVE. SEE "CERTAIN LITIGATION."

                     BY ADOPTING OUR PROPOSALS YOU WILL BE GIVEN THE OPPORTUNITY
TO ELECT NOMINEES TO FORM A MAJORITY OF DEXTER'S BOARD WHO ARE COMMITTED TO
PURSUE THE ISP PROPOSAL OR A SUPERIOR PROPOSAL, AND YOU WILL BE GIVEN THE RIGHT
TO DECIDE WHETHER DEXTER'S POISON PILL RIGHTS AGREEMENT SHOULD APPLY TO SUCH A
TRANSACTION. YOU SHOULD NOTE THAT, THERE CAN BE NO ASSURANCE THAT THE ADOPTION
OF OUR PROPOSALS WILL ENSURE THE CONSUMMATION OF SUCH A TRANSACTION. WE
RECOMMEND THAT YOU SIGN, DATE AND RETURN THE GOLD PROXY CARD TODAY IN FAVOR OF
OUR PROPOSALS.


                                       16
<PAGE>
                               CERTAIN LITIGATION

                     On January 27, 2000, we commenced a lawsuit against Dexter
and seven 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 Dexter directors who are named as defendants are K. Grahame Walker,
Henrietta Holsman Fore, Robert M. Furek, Edgar G. Hotard, Peter G. Kelly,
Jean-Francois Saglio and George M. Whitesides.

                     Count I of the Complaint alleges that Article X of the
Dexter bylaws, to the extent it requires a two-third supermajority vote of
Dexter shareholders to amend Dexter's bylaws, is invalid under ss. 33-807 of the
Connecticut Business Corporation Act, which permits supermajority voting
provisions only if expressly authorized by the certificate of incorporation. The
Complaint alleges that Dexter's certificate of incorporation does not authorize
a supermajority provision in the bylaws and therefore any two-thirds voting
requirement in Article X constitutes an ultra vires act of the board of
directors and may not be enforced. Accordingly, the Complaint seeks a
declaratory judgment that: (i) if Article X of the Dexter bylaws imposes a
supermajority voting requirement, then it is invalid, void and of no effect
under Connecticut law; and (ii) Dexter's shareholders may alter, amend or repeal
any Dexter bylaw or bylaws without a supermajority vote. The Complaint also
seeks preliminary and permanent injunctive relief barring enforcement of a
supermajority voting requirement in Article X of Dexter bylaws.

                     Count II of the Complaint alleges that Dexter's poison pill
shareholder rights plan violates ss. 33-665(a) of the Connecticut Business
Corporation Act, which states, in relevant part, that "[a]ll shares of a class
shall have preferences, limitations and relative rights identical with those of
other shares of the same class." The Complaint alleges that Dexter's poison pill
violates ss. 33-665 because it impermissibly discriminates among shares of the
same class of stock by entitling all holders of Dexter common stock, except
shareholders owning 11 percent or more of Dexter's outstanding shares who do not
file a Schedule 13G with the SEC stating that their ownership position has been
acquired without any intent to change or influence control of Dexter, to
exercise the right under certain circumstances to obtain additional shares of
Dexter common stock in exchange for one-half of the then current market price of
Dexter common stock. Accordingly, the Complaint seeks a declaratory judgment
that Dexter's poison pill violates Connecticut law and is ultra vires, invalid,
void and of no effect. The Complaint also seeks preliminary and permanent
injunctive relief barring enforcement of Dexter's poison pill.

                     Counts III, IV and V of the Complaint allege that ISP's
Nominee Election Proposals, Shareholder Rights Proposals and Voting Rights
Proposals are each valid under Connecticut law, consistent with Dexter's
certificate of incorporation and may be voted upon at Dexter's 2000 annual
meeting. The gravamen of these claims is that Dexter's shareholders have the
authority to: (i) amend the bylaws in order to create (and then elect directors
to fill) new directorships; (ii) amend the bylaws to require directors to modify
poison pills and prevent the board from adopting a new poison pill without


                                       17
<PAGE>
shareholder approval; and (iii) amend or repeal bylaws and bar directors from
vetoing shareholder determinations to amend or repeal bylaws.

                     Accordingly, the Complaint seeks a declaratory judgment
that: (i) Dexter's shareholders have the lawful right to increase the size of
Dexter's Board by amending the bylaws and to fill all newly created
directorships by majority vote at the 2000 annual meeting; (ii) that Dexter's
shareholders have the lawful right to amend the bylaws to require that Dexter's
Board amend the poison pill or redeem the rights issued under the rights plan
and to prevent the board from adopting further poison pills without shareholder
approval; and (iii) that the Nominee Election Proposals, Shareholder Rights
Proposals and Voting Rights Proposals are valid under Connecticut law and
consistent with Dexter's certificate of incorporation, are the proper subjects
for action by Dexter's shareholders and may be voted upon by shareholders at
Dexter's 2000 annual meeting. The Complaint also seeks preliminary and permanent
injunctive relief permitting a shareholder vote on these proposals at Dexter's
2000 annual meeting.

                     Count VI of the Complaint alleges that Dexter's directors
have breached their fiduciary and other legal obligations to the company and its
shareholders, including ISP, by, among other things, amending Dexter's poison
pill in October 1999 to apply to 11 percent shareholders who do not file a
Schedule 13G with the SEC stating that their ownership position has been
acquired without any intent to change or influence control of Dexter, refusing
to consider with the care, loyalty and good faith required by law ISP's proposal
to purchase all of Dexter's shares at a price of $45 per share, seeking to
entrench themselves in office and failing to pursue opportunities and
transactions that would benefit Dexter's shareholders and which are in the
company's best interests.

                     The Complaint seeks a declaratory judgment that Dexter's
directors may not breach their fiduciary obligations by acting to impede or
block an offer for Dexter shares at a price of $45 per share or more in cash
either by utilizing Dexter's poison pill or refusing to approve the transaction
under ss. 33-844 of the Connecticut Business Corporation Act (which prohibits
certain transactions with interested shareholders for a five-year period unless
approved by the board). The Complaint also seeks preliminary and permanent
injunctive relief barring Dexter's directors from acting to impede or block such
an offer for Dexter's shares either by utilizing the poison pill or refusing to
approve the transaction under ss. 33-844 of the Connecticut Business Corporation
Act. In addition, the Complaint seeks injunctive and declaratory relief
preventing Dexter's directors from conducting Dexter's 2000 annual meeting of
Dexter's shareholders after April 30, 2000. Furthermore, the Complaint seeks
money damages arising from the directors' breach of their legal obligations.

                     None of ISP's nominees are named parties to the litigation.
Two of ISP's nominees, Samuel J. Heyman and Sunil Kumar, however, are affiliated
with ISP and ISP Investments Inc., which are the named plaintiffs in the
litigation. Mr. Heyman is also the beneficial owner (as defined in Rule 13d-3)
of approximately 76% of the capital stock of ISP.


                                       18
<PAGE>
                          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 the largest Dexter shareholder and
an investor in the company's shares since September 1998, we have been
dissatisfied with the share price performance of Dexter's common stock.
Specifically, we have discussed with representatives of Dexter a recommendation
with respect to the separation of Life Technologies and Dexter. Dexter rejected
our recommendation. Therefore, on December 14, 1999, we proposed a business
combination in which Dexter shareholders would receive at least $45 per share in
cash, subject to the negotiation of a mutually acceptable merger agreement. Set
forth below is a summary of events leading up to and following 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


                                       19
<PAGE>
        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 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.


                                       20
<PAGE>
                     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. On November 25, 1998, we signed an agreement
with Bear, Stearns & Co. Inc., The Frederick R. Adler Intangible Asset
Management Trust, The Cohen Revocable Trust and Annie Chang, each of whom is a
shareholder of Life Technologies, to form a group (the "Life Technologies
Group") for purposes of Section 13(d) of the Securities Exchange Act of 1934, as
amended (the "Exchange Act"). The agreement was for a term of six months and
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 the other members of the Life
Technologies Group, filed an amendment to our Schedule 13D reporting our group
ownership of Life Technologies shares. On December 2, 1998, each of York Capital
Management, L.P., JGD Management Corp. and York Investment Limited became
members of the Life Technologies Group, and on December 18, 1998, each of Idoya
Partners, Prescott Associates, Prescott International Partners, L.P., Thomas W.
Smith as Trustee for the Jack McKenzie Trust Under Agreement Dated April 12,
1992, Thomas W. Smith as Trustee for the Leo Carroll Wolfensohn Trust Under
Agreement Dated March 9, 1994 and Thomas W. Smith (collectively, the "Prescott
Entities") joined the Life Technologies Group, in each case by entering into
similar agreements with the other existing members of the Life Technologies
Group. Additional amendments to our Schedule 13D were filed to reflect the
additional members of the Life Technologies Group, so that, as of December 23,
1998 we, together with the other members of the Life Technologies Group, 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 Commission 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,
Dexter's Board 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 share price performance. 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


                                       21
<PAGE>
than in combination with Dexter, for reasons detailed in Mr. Heyman's letter to
Mr. Walker on December 14, 1999. 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 it
would be in the best interests of both companies and their respective
shareholders if Dexter and Life Technologies were independent corporate
entities. We further offered to work with Dexter to try to develop a tax
efficient strategy, subject to a proper business purpose, to separate Dexter and
Life Technologies.

                     On December 6, 1999, pursuant to an amended Life
Technologies 13D filing, we disclosed that our initial group agreements 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 of the
members of the Life Technologies Group other than the Prescott Entities.
Currently, the continuing members of the Life Technologies 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:

           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


                                       22
<PAGE>
           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. 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).


                                       23
<PAGE>
                     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.

                                             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.


                                       24
<PAGE>
                     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 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.


                                       25
<PAGE>
                     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

                     In a complaint filed in Connecticut Superior Court dated
January 18, 2000, Lee Brennan and Ellis Investments LTD. asserted claims on
behalf of themselves and a putative class consisting of all Dexter shareholders
(other than the defendants and any person or entity affiliated with them)
against Dexter, Mr.Walker and the directors of Dexter, asserting claims which
were previously brought separately in the Delaware courts. In their complaint,
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
Dexter's 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


                                       26
<PAGE>
           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 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.


                                       27
<PAGE>
                     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 seven members of
Dexter's Board in the United States District Court for the District of
Connecticut. The Dexter directors who are named as defendants are K. Grahame
Walker, Henrietta Holsman Fore, Robert M. Furek, Edgar G. Hotard, Peter G.
Kelly, Jean-Francois Saglio and George M. Whitesides. 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
the Life Technologies Group, amended our 13D filing to reflect the group's
rejection of Dexter's offer to purchase shares of 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, by no later than February 7, 2000.

                     On February 4, 2000, Dexter acknowledged its receipt of our
written notice to bring our proposals before the 2000 Annual Meeting. Shortly
thereafter, by letter dated February 7, 2000, Dexter's counsel, Skadden, Arps,
Slate, Meagher & Flom LLP, acknowledged its receipt of our demand for a copy of
Dexter's shareholder list and certain other corporate information. In its
February 7 letter, Dexter's counsel stated that ISP needed to provide Dexter
with a certified check in the amount of $1,454.86 to cover expenses incurred by
Dexter in providing the requested materials before such materials would be made
available, and a check was forwarded by ISP to Dexter promptly thereafter.
Certain, but not all, of the materials requested were received on February 11,
2000.

                     On February 8, 2000, Dexter's Board amended the Rights
Agreement, causing the poison pill Rights to be inapplicable to any offer which
is for all shares, is substantially unconditional, remains available to
shareholders for 60 days, is supported by firm financing commitments and is for
a price which is, in the opinion of Dexter's financial advisor, fair from a
financial point of view.

                     On February 9, 2000, Mr. Walker sent the following letter
to ISP responding to ISP's notice of its intention to present its proposals and
director nominations at the 2000 Annual Meeting:


                                       28
<PAGE>
           Dear Mr. Heyman:

                     Just last month ISP disclosed that your company's 4th
           quarter operating results would be 40% to 57% below analysts'
           estimates and that full fiscal year operating results would be 19% to
           20% below analysts' estimates. You publicly attributed ISP's
           disappointing performance to "substantial unabsorbed manufacturing
           costs" and to "competitive pressures." With evidence of this kind of
           managerial dereliction so recently emerging, we are incredulous that
           you have apparently launched a campaign that deflects the focus from
           concentrating on improving your own poor results to one that will
           inevitably harass and distract Dexter's Board and its management at
           this crucial time in our company's history. We think ISP's
           stockholders have a right to expect undivided and more effective
           attention to ISP's obvious strategic and operational deficiencies. We
           think they are entitled to expect that you would not spend hundreds
           of thousands of dollars - to say nothing of the time, effort and
           managerial distraction ISP will devote to matters unrelated to its
           immediate business problems - to run a spurious and legally defective
           proxy campaign in support of your invitation to negotiate that has
           been rejected.

                     However, since you are anxious to pursue a course of action
           that can be harmful to our shareholders and to yours, you leave us
           with no reasonable alternative but to deal with you in the most
           responsible manner that we can. To that end, our Board has authorized
           the following actions:

                1.      Specifically to address your claim of "[ISP's] stated
                        willingness to pay more [than $45 per share] if
                        additional information justified a higher price," we are
                        prepared to make available a due diligence data room
                        containing detailed and comprehensive information
                        relating to both Dexter and Life Technologies. Because
                        our Board and its advisors believe that your offer is
                        inadequate from a financial point of view, we are
                        inviting ISP to send representatives into the data room
                        for the purpose of ascertaining whether you are indeed
                        willing to pay more. If you wish, you are welcome to
                        bring representatives of your lender Chase Securities
                        Inc. with you. We are prepared to respond to reasonable
                        requests for additional information and we will make
                        appropriate members of senior management available for
                        presentations and question/answer sessions that should
                        provide you with more than adequate "additional
                        information." We accept your offer of a confidentiality
                        agreement in this connection. We accept in principle
                        your limitation that the agreement not "limit your
                        rights as shareholders" by which we mean one which will
                        not prevent you from making a tender offer to Dexter
                        stockholders, proceeding with your proxy campaign or
                        making a proposal to the Board of Dexter.

                     Do not misread the Board's decision or its intentions: we
           have made no decision to sell the company or to explore a sale of the
           company or to test the market for a possible sale of the company, and
           no one else will be invited into the data room. It is simply the
           Board's firm belief that Dexter's stockholders should not be
           victimized by your disingenuous suggestion that your price could be
           higher but for reasons beyond your control. We offer you the


                                       29
<PAGE>
           opportunity to conduct a reasonable due diligence so that you can
           honestly, forthrightly and candidly tell our stockholders what your
           proposal is - not that it might be higher if . . .

                2.      Our Board has amended Dexter's stockholder rights plan.
                        As a consequence of the amendment, the rights will not
                        be triggered by and the plan will pose no obstacle for
                        any offer to our stockholders for all shares which
                        Dexter's financial advisor opines is fair from a
                        financial point of view, is supported by liquid funds on
                        hand or by fully committed financing, is substantially
                        unconditional and has been open to Dexter stockholders
                        for at least 60 calendar days. Although we believe your
                        rights plan proposals for our stockholder meeting are
                        illegal and unenforceable, we have elected to preempt
                        this issue. We believe our stockholders' interests will
                        be better served if we relieve them of the burden of a
                        lot of rhetorical sound and fury from ISP designed to
                        obfuscate its plan and intention to seize control of
                        Dexter without paying a fair price for the company.

                3.      We will address your proposals for Dexter's 2000 Annual
                        Meeting of Stockholders separately. However, on the
                        subject of electing directors, Dexter accepts the
                        nomination of yourself, Mr. Kumar and Mr. Peller as
                        timely in accordance with the By-laws.

                     You claim Chase Securities Inc. has advised ISP in writing
           "that they are highly confident in their ability to arrange credit
           facilities for this acquisition." If that were true, we think ISP
           owes it to the Dexter stockholders to make an honest, forthright and
           candid public disclosure of the letter text. We think ISP's failure
           to do so is yet another instance of its disregard for the federal
           securities laws which we believe required disclosure of ISP's
           contracts, arrangements, understandings and relationships with Chase
           Securities promptly after it received their assurances. We also think
           ISP's disclosure is legally deficient for failing to describe the
           transactions in which the funds will be borrowed and the names of the
           parties thereto.

                     In December you said that the impetus for your takeover
           proposal was, among other things, your belief that it was in the best
           interests of both Dexter and Life Technologies and their stockholders
           "if Dexter Corporation and Life Technologies were separate corporate
           entities." In our meeting you stated that you would support a
           pro-rata spinoff of the LTI shares owned by Dexter to Dexter
           stockholders and you stated that such a transaction could be effected
           on a tax-free basis. We are advised to the contrary. We should
           provide our stockholders an honest, forthright and candid assessment
           of this issue. In order to achieve that, we invite you to help us
           arrange a meeting among our respective tax advisors to reach a common
           analytical conclusion. We think the Dexter stockholders are entitled
           to know whether or not there is any possibility that such a
           transaction could be effected without incurring material tax
           liabilities at Dexter or for the account of the stockholder
           recipients of the spinoff.


                                       30
<PAGE>
                     There is another allegation in your letter relating to LTI
           which I feel I must briefly address. You keep talking about Dexter's
           ability to retain and recruit key personnel at LTI. We have been a
           majority stockholder of LTI for nearly two decades without any
           problems either in recruiting or retaining key personnel, and if it
           were not for the uncertainty that your tactics have introduced we are
           confident that would continue. I think it particularly telling on the
           subject of executive retention that, in contract to ISP, LTI has
           retained its entire senior management team (except the CFO who
           retired to teach and remains a director of LTI).

                     Your letter claims "[a]s you know, Life Technologies'
           shareholders have rejected Dexter's recent belated $49 per share
           offer." As you know, this statement is false. First, as of this very
           moment, neither you nor any other member of your current 13D group
           has spoken or written a word to Dexter in response to our good faith
           $49 proposal. Second, a former member of your 13D group who owned
           more than 825,000 shares (about 3.3% of LTI and over 13% of the
           shares owned by your former 13D group) responded favorably to our
           proposal, and we acquired those shares for $49 each. Moreover, you
           also know our offer was in no way an attempt to provide benefits to
           ISP not available to other Dexter stockholders - it was an offer to
           buy LTI shares from LTI stockholders, whether or not they were Dexter
           stockholders. In fact, it was an honest, forthright and candid
           attempt to resolve a difficult situation created by ISP solely for
           its own selfish purposes. Although obvious from the terms of our
           offer, we repeat here for the record there was no condition
           associated with ISP's reaction to our proposal. As we clearly stated,
           we were perfectly willing to discuss our proposal with any other
           stockholders of Life Technologies who wished to do so, and we in fact
           did that very thing.

                     Mr. Heyman, your campaign to anoint yourself as the savior
           of Dexter stockholders is misleading because, ultimately, it is ISP's
           own selfish interests which drive your program. The shareholders will
           understand that. Moreover, it appears that your hand-picked nominees
           lack the necessary experience in corporate governance and in our
           industry and none owns a single share of Dexter stock. By contrast,
           the Dexter Board has demonstrated its independence and commitment to
           serving the Dexter shareholders. We will continue to forthrightly and
           clearly articulate our program for value enhancement for our
           stockholders to consider. I am confident that our stockholders will
           understand it, agree with it and act accordingly.

                                                  Sincerely,

                                                  /s/  K. Grahame Walker

                     On February 9, 2000, Mr. Heyman sent the following letter
to Mr. Walker in response to Dexter's offer to allow ISP to conduct a due
diligence review of the business, finances and operations of Dexter and its
subsidiaries:


                                       31
<PAGE>
           Dear Grahame:

                     We are in receipt of your letter today and, while not
           commenting on the host of ancillary issues raised, we agree that the
           central focus should be whether Dexter's shareholders are able to
           maximize the value of their investment. We take at face value your
           statement that Dexter is willing to enter into substantive
           discussions with us regarding ISP's proposal and are delighted that
           you have taken this step. I have asked our legal counsel to prepare a
           confidentiality agreement and advise you that we are in a position to
           move very promptly.

                     All the best.

                                                  Sincerely,

                                                  /s/ Samuel J. Heyman

                     On February 9, 2000, Mr. Walker sent the following letter
to Mr. Heyman in response to Mr. Heyman's letter of the same date:

           Dear Mr. Heyman:

                     Your letter this afternoon suggests that you need to reread
           my letter of this morning. Please have your counsel contact ours on
           the subject of a confidentiality agreement. I believe they are
           well-acquainted.


                                                       Sincerely,

                                                       /s/ K. Grahame Walker


                     On February 23, 2000, ISP and Dexter entered into a
confidentiality agreement which provided for ISP to conduct a review of
non-public information relating to the business, finances and operations of
Dexter and its subsidiaries and which did not contain any standstill provisions.
On February 24, 2000, ISP commenced a review of certain information made
available by Dexter in a data room.

                     On February 28, 2000, Dexter issued a press release in
which it announced that it would "institute a process in which we [Dexter] will
survey all of the Company's available options." Dexter stated in its press
release that although Dexter's Board "has made no decision to sell the Company
at this time," it would explore "every available alternative - including a
merger or sale of the Company, a financial restructuring, or a spin-off or sale
of one or more of the Company's businesses." Dexter further stated in its press
release that "third parties will be invited to sign confidentiality agreements,
review comprehensive data room materials and receive Dexter management
presentations."

                     On March 1, 2000, Dexter filed its preliminary proxy
statement with the SEC. Mr. Heyman sent the following letter to Mr. Walker
addressing Dexter's February 28 press release and the filing:


                                       32
<PAGE>
           Dear Grahame:

                     With regard to your February 28th announcement that your
           Board "has decided to institute a process in which we will survey all
           of the Company's options," we would hope that this move was indeed
           designed with the view toward maximizing shareholder value for all
           Dexter shareholders as we have been urging for quite some time now.
           As you know, while your Board has made no decision to sell Dexter at
           this time, our nominees are committed to pursue ISP's $45 per share
           merger proposal or a superior proposal.

                     We also note Dexter's statement that it will consider a
           "spin-off or sale of one or more of the Company's businesses." In
           this connection, we would remind you that ISP's interest continues to
           be in the acquisition of Dexter as a whole and therefore trust that,
           before considering any such dismemberment, Dexter will enter into
           discussions with ISP concerning our acquisition proposal.

                     Although we are pleased that you have started to provide us
           with information, we will need certain additional technical,
           financial and operating data. We are compiling a separate list
           concerning these requirements which we will furnish shortly to your
           representatives, and I would very much appreciate your cooperation
           with regard to these requests.

                     Finally, we have just received your preliminary proxy
           statement that was filed with the SEC for the first time today. We
           were shocked and surprised by your decision to selectively choose
           among the ISP proposals to be presented to Dexter shareholders at
           this year's Annual Meeting scheduled for April 27 - and especially by
           your attempt to deny Dexter shareholders the right to vote on our
           proposal to increase the size of the Dexter Board. We believe this
           proposal is legal, appropriate, and was timely made, and ISP intends
           to present this proposal at the Annual Meeting and take all necessary
           legal action to cause its implementation if passed. We also do not
           understand your position that Dexter will refuse to follow the wishes
           of its shareholders in the event that they adopt ISP's Rights Plan
           proposals.

                                  All the best.

                                                       Sincerely,
                                                       /s/ Samuel J. Heyman


<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.

           If each of our proposals is adopted, the overall result would be that
the intended effect of certain of Dexter's anti-takeover measures - the
classified board of directors and the "poison pill" Rights Agreement - could be
neutralized. In addition, you should know that our nominees are committed to
pursue the ISP Proposal or a superior proposal. If our nominees are elected as a
majority of Dexter's Board, the anti-takeover measures mentioned above, as well
as the Connecticut statutory anti-takeover devices described in the discussion
of Proposal No. 4 below, could be potentially removed by Dexter's Board in
connection with any approval of the ISP Proposal or a superior proposal -
regardless of the outcome of the vote on our Shareholder Rights Proposals. Any
action taken by our nominees, if elected as directors, will be subject to their
fiduciary duties to you. In addition, note that we are seeking to have the
Rights Agreement judicially invalidated. See "Certain Litigation." If the Rights
Agreement is judicially invalidated prior to the 2000 Annual Meeting, we will
withdraw our Shareholder Rights Proposals.

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>                                                          <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


                                       34
<PAGE>
                                          1999. He has also been a director, Chairman and
                                          Chief Executive Officer of GAF Corporation
                                          ("GAF"), and certain of its subsidiaries for
                                          more than five years. GAF's primary business is
                                          conducted through Building Materials
                                          Corporation of America ("BMCA"), an indirect,
                                          approximately 97%-owned subsidiary of GAF which
                                          is primarily engaged in the commercial and
                                          residential roofing business. Mr. Heyman has
                                          been a director and Chairman of BMCA 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 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>


                                       35
<PAGE>

           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. However, if any of
the nominees are unable to serve or for good cause will not serve, 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


           PROPOSAL NO. 2: THE BOARD SIZE BYLAW PROPOSAL

           We are proposing a Bylaw amendment that would require additional
directors to be elected at the 2000 Annual Meeting so that Dexter's Board will
consist of seventeen directorships, rather than its current ten directorships.
If our Board Size Bylaw Proposal is adopted, Dexter shareholders 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 Dexter shareholders to
elect a majority of Dexter's 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 Dexter's 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 Board Size Bylaw Proposal will allow you to elect a majority of
Dexter's Board of Directors at the 2000 Annual Meeting. The adoption of our
Board Size Bylaw Proposal would have the effect of neutralizing the impact of
Dexter's classified Board of Directors, which is divided into three classes
serving staggered, three-year terms. Opponents of classified boards, like
Dexter's, believe that they help entrench the incumbency of the current board
and therefore deter change in control transactions which may be beneficial to
shareholders, because ordinarily at least two annual meetings - rather than one
- - would be required before a change in control of the board could be effected.
However, proponents of classified boards argue that the device encourages a
party seeking to obtain control of a company to negotiate with the board, and
that it provides continuity and stability to a company and its business and
operational strategies. If all of our nominees are elected, a majority of
Dexter's directors would not be current incumbents and a lack of continuity in
Dexter's corporate policy and governance may occur. However, our nominees, if
elected, and Dexter's incumbent directors, if reelected,


                                       36
<PAGE>

would owe the same fiduciary duties to Dexter shareholders. Given the refusal of
Dexter's current board to commit to pursue the ISP Proposal or a superior
proposal - we believe now is an appropriate time to create a new majority on
Dexter's Board.

           The proposed Bylaw amendment provides that the new Bylaw provision
cannot be unilaterally repealed or altered by Dexter's Board. This means that a
shareholder vote - with the votes cast "for" exceeding the votes cast "against"
- - will be required to amend or repeal the Bylaw provision, if it is adopted.
Ordinarily, Dexter's Board can unilaterally amend, adopt or repeal Bylaws.
Connecticut law permits the board's rights to amend or repeal bylaws to be
limited if so provided by the shareholders in connection with adopting any Bylaw
amendment. If the Board Size Bylaw is adopted, Dexter's Board elected at the
2000 Annual Meeting will still be able to change the size of Dexter's Board from
and after the date of the meeting. 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 Dexter's 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 Dexter's 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>                                                        <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,
Corporation                                the North American marketing arm of Yokohama
601 S. Acacia                              Rubber Company, a worldwide tire manufacturer,
Fullerton, CA                              since August 1997. From September 1996 until
92834-4550                                 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.


                                       37
<PAGE>


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
   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


                                       38
<PAGE>
                                           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
                                           Mack-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. However, if any of
the nominees are unable to serve or for good cause will not serve, 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
Dexter's Board to redeem the Rights, or to amend the Rights Agreement to make
the Rights inapplicable to transactions or offers specified by Dexter
shareholders, if shareholders adopt a special resolution requiring Dexter's
Board to do so. Such a resolution could be adopted at any duly organized
shareholder's meeting where a quorum is present if the votes cast for the
resolution exceed the votes cast against the resolution. In addition, our
proposed amendment would require Dexter's 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 III to this proxy statement.

           Our Poison Pill Bylaw Proposal would allow Dexter shareholders to
make their own decision with respect to proposed offers or transactions, by
requiring that Dexter's Board follow the direction of Dexter shareholders with
respect to the amendment or replacement of the Rights Agreement or the
redemption of the Rights issued thereunder. If our proposed Bylaw amendment is
adopted, in order for Dexter shareholders to mandate Dexter's Board to redeem
the Rights or amend the Rights


                                       39
<PAGE>

Agreement, Dexter 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. As
described below, our Poison Pill Amendment Proposal proposes the adoption of a
special shareholder resolution requiring Dexter's 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. Our Poison Pill
Bylaw Proposal and Poison Pill Amendment Proposal, taken together, will cause
the Rights Agreement to remain in effect to deter unsolicited proposals for less
than $45 per share in cash for all shares, for partial offers, and for non-cash
transactions. However, if our proposals are adopted, the Rights Agreement will
no longer apply to any proposal for all shares at a price of at least $45 per
share. As described in "Certain Litigation" we are seeking to have the Rights
Agreement invalidated in its entirety. If the Rights Agreement is invalidated,
it will no longer be an obstacle to stock accumulations or offers at any price.
If the Rights Agreement is judicially invalidated prior to the 2000 Annual
Meeting, we will withdraw our Shareholder Rights Proposals.

           Dexter's Certificate of Incorporation and Connecticut law provide
significant impediments to many forms of unsolicited offers for Dexter, in
addition to the Rights Agreement. 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 Dexter's Board in a single
year, absent an amendment to the Bylaws approved by Dexter 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
Dexter's 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 Dexter's 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 Dexter's 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. Our nominees are committed to pursue the
ISP Proposal or a superior proposal. If our nominees are elected as a majority
of Dexter's Board, they could potentially neutralize these anti-takeover devices
by participating in Dexter's Board's approval of the ISP Proposal or a superior
proposal.

           Poison pills are considered extremely potent corporate takeover
defense mechanisms, and Dexter's existing Rights Agreement may be viewed as
being 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. Removal
of a poison pill could make the


                                       40
<PAGE>

accomplishment of a given transaction, such as a tender offer, easier even if it
is unfavorable to the interests of shareholders and could make the removal of
management easier, even if such removal would be generally detrimental to
shareholders. Our Poison Pill Bylaw Proposal and Poison Pill Amendment Proposal,
taken together, would in effect remove Dexter's poison pill with respect to any
offer for all outstanding Dexter shares for at least $45 per share in cash.

           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. As
described below, in recent years, shareholders of other public companies have
demonstrated, through the shareholder proposal process, a growing consensus
opposed to adoption of rights plans by management. According to a 1999 report by
the Investor Responsibility Research Center, a provider of corporate research
("IRRC"), voting in favor of shareholder resolutions to redeem or require a
shareholder vote on poison pill rights plans has steadily increased from less
than 30% in 1987 to 57.4% in 1998. Georgeson Shareholder Communications, Inc., a
proxy solicitor that monitors proposals sponsored by institutions and
shareholders ("Georgeson"), in a 1999 report, reported 1999 voting (at an
interim point in the year) was 59% in favor of such proposals.

           The 1999 IRRC report indicates that shareholder proponents submitted
26 anti-pill proposals in 1998 (of which 14 were put to a vote of shareholders),
resulting in then-record support by an average of 57.4 percent of shares voted.
This report indicated that, as of early 1999, 35 anti-pill proposals had been
submitted for 1999. Georgeson's 1999 report indicates that among the 17 poison
pill rescission votes that it monitored in 1999, results were available in 16,
and 13 were approved by shareholders. On average, 59 percent of votes cast were
in favor of the proposals to rescind the pills. According to a 1998 report of
the IRRC, in 1997, proposals to redeem or permit shareholder voting on poison
pills were put to a vote at 23 companies and passed at 13. According to the 1999
IRRC report, in 1998, proposals to redeem or permit shareholder voting on poison
pills were put to a vote at 14 companies and passed at 9. Shareholders opposed
to poison pills assert that poison pills can pose such an obstacle to a takeover
that management becomes entrenched. We believe that such entrenchment and the
consequential lack of management accountability to shareholders adversely
affects shareholder value and that poison pills can deter desirable acquisition
offers that would be in the shareholders' best interests. We believe that poison
pills insulate management from the threat of a change in control because they
provide a board, which is generally advised by and includes representatives of
management, with veto power over change in control bids, even when shareholders
believe that such bids are in their best interests.

           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 Bylaw Proposal. See "Certain
Litigation."


                                       41
<PAGE>


           The proposed Bylaw amendment provides that the new Bylaw provision
cannot be unilaterally repealed or altered by Dexter's Board. This means that a
shareholder vote - with the votes cast "for" exceeding the votes cast "against"
- - will be required to amend or repeal the Bylaw provision, if it is adopted.
Ordinarily, Dexter's Board can unilaterally amend, adopt or repeal Bylaws.
Connecticut law permits the board's rights to amend or repeal bylaws to be
limited if so provided by the shareholders in connection with adopting any bylaw
amendment. The full text of the Bylaw amendment to effect the Poison Pill Bylaw
Proposal is contained in Annex III to this proxy statement.

                       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 Dexter's 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. The effect of our Poison Pill Bylaw
Proposal and our Poison Pill Amendment Proposal, if each is adopted, would be to
render the Rights Agreement inapplicable to any offer for at least $45 per share
in cash for all shares. The Rights Agreement would remain in full force and
effect with respect to all offers for less than $45 per share, offers for less
than all shares and non-cash offers, unless we are successful in having the
Rights Agreement judicially invalidated. We are proposing a $45 per share
threshold solely because the ISP Proposal is for at least $45 per share. You
should be aware that Dexter has rejected our $45 per share proposal as being
inadequate. In addition, it can be argued that a $45 level is inappropriate
because the value of a Company is constantly changing, or you could conclude
that you believe that the minimum premium for control of Dexter should be
higher. However, we believe that the adoption of our proposal would send a clear
message to Dexter's Board that it should pursue offers of at least $45 and would
end the uncertainty as to the minimum bid required to make the defensive
provisions of the Rights Agreement inapplicable. 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 Dexter shareholders. We propose to repeal any Bylaw amendments adopted by
Dexter's Board between February 26, 1999 and the date of the 2000 Annual
Meeting.


                                       42
<PAGE>

The purpose of this proposal is to prevent Dexter's Board from interfering with
the implementation of the proposals being acted upon by Dexter 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.

           We believe that any Bylaw amendments adopted by Dexter's 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 Dexter's Board
since February 26, 1999. Any Bylaw amendments validly adopted by Dexter's Board
prior to the Annual Meeting would remain in effect unless and until our proposal
to repeal such Bylaws is adopted. If Dexter's 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, Dexter 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 Dexter 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




                                       43
<PAGE>

RATIFICATION OF APPOINTMENT OF INDEPENDENT AUDITORS

           As set forth in Dexter's Proxy Statement, at the 2000 Annual Meeting,
Dexter shareholders will be asked to ratify the appointment by Dexter's Board of
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, or making other proposals as may be appropriate to address any
action of Dexter's 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 February 25, 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 23,058,969 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.


                                       44
<PAGE>


           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 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. Accordingly, our
           Bylaw amendment proposals could each be approved by less than a
           majority of the issued and outstanding shares of common stock once a
           quorum is present at the 2000 Annual Meeting. 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. Levett Rockwood P.C. has consented to the use of its name and
           the reference to its opinion in this Proxy Statement. 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. Accordingly, these
           proposals could be adopted by less than a majority of the issued and
           outstanding shares of common stock once a quorum is present at the
           2000 Annual Meeting. Our Poison Pill Amendment Proposal will not be
           effective unless our Poison Pill Bylaw Proposal is adopted.


                                       45
<PAGE>


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

                            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 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.,


                                       46
<PAGE>

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.

                          PROXY SOLICITATION; EXPENSES

           This proxy statement and the accompanying GOLD Proxy Card are first
being furnished to shareholders on or about March ___, 2000. 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
which was determined by reference to financial advisory and financing fees
typically earned by commercial and investment banking institutions for such
services, taking into account Chase Securities' relationship with ISP. Chase
will also receive 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.


                                       47
<PAGE>

           The entire expense of our proxy solicitation is being borne by ISP.
In the event that our nominees are elected to Dexter's Board, we may seek
reimbursement of such expenses from Dexter. ISP does not intend to seek
reimbursement for the stipend it pays to its nominees and does not intend to
seek shareholder approval of reimbursement of its other expenses. 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 $___.

                 CERTAIN INFORMATION CONCERNING THE PARTICIPANTS

           ISP, ISP Investments, our nominees for directorships and the
following officers of ISP 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: Randall Lay, Executive Vice President and Chief Financial Officer;
Kumar Shah, Senior Vice President-Corporate Development; Susan B. Yoss, Senior
Vice President and Treasurer; Christopher Nolan, Vice President-Corporate
Development and Investor Relations; Jared Landaw, Vice President-Law; and Ben
Stoller, Manager-Corporate Finance. 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 ISP and ISP Investments 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.


                                       48
<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.

Between November 25, 1998 and December 18, 1998, ISP entered into agreements
(the "Group Agreements") with Bear, Stearns & Co. Inc., The Frederick R. Adler
Intangible Asset Management Trust, The Cohen Revocable Trust, Annie Chang, York
Capital Management, L.P., JGD Management Corp., York Investment Limited and the
Prescott Entities 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 Agreements, 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 Agreements 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 Agreements provided for a term of six months, but subsequent
agreements were entered into ultimately extending the term through September 30,
2000 for all but the Prescott Entities. 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.


                                       49
<PAGE>


                         SECURITY OWNERSHIP OF DIRECTORS
                            AND MANAGEMENT OF DEXTER

           The following table presents, as of December 31, 1999, based solely
on information contained in Dexter's 2000 Proxy Statement, the common stock
beneficially owned (as that term is defined by the SEC) by all directors and
named executive officers of Dexter, and the directors and executive officers of
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 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>                           <C>
K. Grahame Walker..............................................                  229,681                       *
Kathleen Burdett...............................................                   63,668                       *
John D. Thompson...............................................                   38,241                       *
Bruce H. Beatt.................................................                   34,744                       *
David G. Gordon................................................                   42,579                       *
Charles H. Curl................................................                    4,165                       *
Henrietta Holsman Fore.........................................                    5,626                       *
Bernard M. Fox.................................................                    4,973                       *
Robert M. Furek................................................                    4,510                       *
Martha Clark Goss..............................................                    4,274                       *
Edgar G. Hotard................................................                    3,148                       *
Peter G. Kelly.................................................                    8,301                       *
Jean-Francois Saglio...........................................                    3,201                       *
George M. Whitesides...........................................                    4,381                       *
All Directors and Executive Officers of
Dexter as a Group (24 persons).................................                  638,727                       2.77
</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") and the 1999 Long Term Incentive Plan (the "1999 Plan"): K.
    Grahame Walker - 51,434; Kathleen Burdett - 21,142; John D. Thompson -
    14,976; Bruce H. Beatt - 13,972; David G. Gordon - 11,460; and "All
    Directors and Executive Officers of Dexter as a Group" - 171,233. Shares of
    restricted stock issued pursuant to the 1994 Plan and the 1999 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.


                                       50
<PAGE>

                        PRINCIPAL SHAREHOLDERS OF DEXTER

           The following table sets forth, based solely, except as otherwise
described herein, on information contained in Dexter's 2000 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                 9.97(1)
FMR Corp., 82 Devonshire Street Boston, Massachusetts 02109
(Fidelity Managed Funds).......................................                1,703,300                  9.8(2)
Mary K. Coffin, c/o Dexter Corporation, One Elm Street, Windsor
Locks, Connecticut 06096.......................................                1,290,000                  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, 1999, as reported on the Schedule 13G
      most recently filed by such shareholder.

(3)   Of the 1,290,000 shares shown in the table as owned by Mary K. Coffin,
      990,000 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
      shown in the table are held by Mary K. Coffin through a living trust.


                                       51
<PAGE>


               SHAREHOLDERS' PROPOSALS IN DEXTER'S PROXY STATEMENT

           The Dexter's Bylaws require that notice of nominations to Dexter's
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 Dexter's 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:  March __, 2000

                                  Sincerely,

                                  Your Fellow Shareholders:

                                  INTERNATIONAL SPECIALTY PRODUCTS INC.

                                  ISP INVESTMENTS INC.



                                       52
<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 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 and fifth 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                 INDEBTEDNESS 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. Because the
           securities from multiple investments are pooled in one account, the
           amount of margin indebtedness incurred by ISP in connection with its
           purchases of Dexter Common Stock, which purchases were numerous and
           made over many months, is impossible to determine with any degree of
           certainty.

           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. YOU MAY
APPROVE OR VOTE SEPARATELY ON ANY OR ALL OF THE PROPOSALS, BUT PROPOSAL NO. 3
WILL NOT BE EFFECTIVE UNLESS PROPOSAL NO. 2 IS ADOPTED, AND PROPOSAL NO. 5 WILL
NOT BE EFFECTIVE UNLESS PROPOSAL NO. 4 IS ADOPTED.





                (CONTINUED AND TO BE SIGNED ON THE REVERSE SIDE)


<PAGE>

<TABLE>
<CAPTION>
                                                ISP RECOMMENDS A VOTE "FOR" THE NOMINEES LISTED BELOW.
                                                                       ---
<S>     <C>        <C>                      <C>       <C>    <C>             <C>      <C>               <C>               <C>
            1.       Election of Directors

FOR all nominees listed on the right        WITHHOLD AUTHORITY to vote for   NOMINEES: Samuel J. Heyman, Sunil Kumar, Philip Peller
(except as marked to the contrary hereon).  all nominees listed to the       (Instructions:  To withhold authority to vote for any
                                            right.                           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 BYLAW PROPOSAL                                                 [_]                [_]                [_]

                                                                                        FOR              AGAINST            ABSTAIN
5.       THE POISON PILL AMENDMENT 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

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

                                                                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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