Document:

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                                                                   Exhibit 10(y)

Hadia Lefavre
Executive Vice President
Human Resources Worldwide

                                                    July 16, 2001 (revised date)

PERSONAL AND CONFIDENTIAL

James Rogula
[residence address]

Dear Jim:

         Effective July 1, 2001, you will no longer be the Executive Vice
President, North America. All other offices and directorships you may hold with
The Scotts Company (hereinafter referred to as "Scotts" or the "Company") will
also be resigned. You will report directly to Jim Hagedorn to perform job duties
assigned to you. You will remain as a full-time Scotts' associate at your
present level of salary and benefits.

         Should you elect to take retirement, we would like to offer you the
following terms and conditions set forth in this letter agreement (hereinafter
referred to as the "Agreement"). The terms pursuant to which you will be granted
retirement status are as follows:

1.            Effective July 1, 2001, you will retire and resign your
              positions as Executive Vice President, North America, and all
              other offices and directorships you may hold with the Company or
              any of its subsidiaries by executing the attached resignation
              letter. You will remain as a full-time Scotts' associate in your
              present position at your present level of salary and benefits
              through June 30, 2001.

2.            You will be eligible for a prorated payout under the 2001
              Executive Annual Incentive Plan. Payouts under the terms of this
              Plan are expected to be made in late November 2001. You will not
              be eligible for any further stock option grants.

3.            As a reward for your past service to the Company, you
              shall receive the sum of $309,000, payable in a lump sum or twelve
              (12) equal monthly installments of $25,750 each (less required tax
              withholding) beginning in July 2001 and continuing through and
              including June 2002.

4.            You presently have 134,500 outstanding stock options. As a
              retiree, all of these options will vest on the date of your
              retirement. Your ability to exercise these options will be
              governed by the terms and conditions of the Scotts' Stock Option
              Plan pursuant to which they were granted.

     Phone 614-719-5602 Fax 614-719-5596 E-Mail: hadia.lefavre@scottsco.com

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James Rogula
July 16, 2001 (Revised)
Page 2

5.            You will continue to be eligible to participate in the
              Retirement Savings Plan and the Executive Retirement Plan of the
              Company through June 30, 2001. Your benefits pursuant to each such
              Plan will be handled according to your election under the Plan
              options. You should discuss the tax effect of any decisions you
              make with respect to such Plans with your legal or tax advisor.

6.            Under this agreement,  your medical,  dental and vision benefit
              coverage, as you elected under the benefit terms of the plan,
              will be continued  through  June 30,  2001.  Should you elect the
              twelve (12) month  payment  option,  your  medical,  dental and
              vision  coverage  will be continued through the end of the last
              month of your severance  period,  June 2002.  This would cover a
              period of twelve (12) months,  after which you have the option of
              continuing  coverage under COBRA for six (6)  additional  months,
              for a  combined  total of  eighteen  (18)  months of coverage as
              provided  by COBRA.  Should you elect the lump sum option,  you
              will be eligible to purchase  medical,  dental and vision coverage
              for eighteen (18) months,  per your rights provided under COBRA.

7.            Eligibility  for short and long term  disability  benefits  under
              Scotts  group plans  expires on June 30, 2001.  Life  insurance
              stops June 30, 2001.  You have 31 days from the day coverage ends
              to convert the coverage to an  individual  policy or continue  the
              coverage  under the policy's portability  option,  which allows
              you to take the life coverage at your  expense,  based on the
              supplemental  life  insurance  rates we  negotiated  with the
              carrier.  These rates are based on age and smoking  status.  In
              addition,  the  portability  option gives the right to continue
              spouse  life  coverage  at the  same  rate the  company  has
              negotiated  for that coverage.

         Except as set forth in this letter, all other benefits to which you
were entitled as a full-time Scotts' associate cease as of July 1, 2001.

         You are reminded of the terms of the Key Management Scott Associate
Agreement, a copy of which is attached.

         This Agreement is personal and not assignable by you. In the event of
your death prior to July 1, 2001, this Agreement shall terminate as of the last
day of the month during which your death occurred. In such an event, your
designated beneficiary (or if none is designated, your estate) will be paid (i)
all pay and benefits due up through the month of your death, and (ii) the pay,
awards and benefits due as provided for in this Agreement. If your death occurs
while you are still in an employee status, your widow would be entitled to the
benefits applicable to widows under the benefit plans in which you are
participating at the time of your death.

         Scotts is proposing to provide you with the opportunity to receive this
retirement severance package on an exception basis and in return for your
signature of the legal release contained in this Agreement. By executing this
Agreement, you acknowledge and agree that the payments to be made to you and the
other awards and benefits extended to you exceed the normal policies and
practices of the Company and that you have received full and fair consideration
for signing this Agreement.

         If you determine to accept this package, you should sign this Agreement
as discussed below. By signing, you agree, except for the obligations set forth
in this Agreement, that all of Scotts' other

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James Rogula
July 16, 2001 (Revised)
Page 3

obligations and any claims you may have, whether now known or unknown to you
against Scotts, its affiliated corporations and directors or employees thereof
("Releasees") are released. In consideration of the awards and benefits provided
to you herein, you agree not to sue Releasees under any or all causes of action
and agree not to file any complaint or other action with any governmental
agency, including claims of Age Discrimination in employment under the Federal
Age Discrimination in Employment Act and the Older Workers Benefit Protection
Act. Except as specifically stated herein and except as provided in the Scotts'
Retirement Savings Plan and the Scotts' Executive Retirement Plan, you agree
that you have no claim for and will not be entitled to any other benefits,
bonus, compensation, perquisites, sick pay allowance or any kind of other
remuneration arising out of your employment.

         You agree to keep the terms of this Agreement confidential and not to
disclose any information concerning these matters to anyone (excluding your
spouse, your financial advisor, tax preparer and any attorney you may retain,
who will honor the confidentiality of this Agreement), including but not limited
to past, present or future employees of Scotts or its affiliates. As a former
officer of the Company you will be entitled to be indemnified pursuant to the
terms of the Company's by-laws, articles of incorporation and policies of
insurance.

         You will have until July 17, 2001, to consider this offer. If you
accept, you will have seven (7) calendar days from the date of acceptance to
revoke this Agreement.

         This Agreement contains the release of important legal rights. You
should consult with an attorney before executing it.

         This Agreement will be construed in accordance with the substantive
laws of the State of Ohio. The rights and duties of the parties shall not be
assignable. The Agreement may not be amended except in writing signed by the
party against whom an obligation is to be enforced. You acknowledge that no
representations, other than those contained herein, have been made as an
inducement for you to accept the terms of this Agreement.

     Intending to be legally bound hereby, we have executed this
Agreement this  16th day of July, 2001.

THE SCOTTS COMPANY

By:      /s/ Hadia Lefavre
   -----------------------------------------
         Hadia Lefavre
         Executive Vice President

ACCEPTANCE:

         /s/ James Rogula
-----------------------------------------
        James Rogula<PAGE>   1
                                                                   EXHIBIT 10(b)
                               HEADS OF AGREEMENT

         THIS HEADS OF AGREEMENT ("Agreement") is made as of April 23, 2001,
between OM Group, Inc., a Delaware corporation ("OMG"), and Ferro Corporation,
an Ohio corporation ("Ferro") (each of OMG and Ferro a "party" and together, the
"Parties").

         WHEREAS, pursuant to a Purchase Agreement of even date herewith
("Purchase Agreement") among OMG, dmc2 Degussa Metals Catalysts Cerdec AG
("Seller") and Degussa AG ("Degussa"), a copy of which is attached hereto as
EXHIBIT A, Seller will sell to OMG, and OMG will purchase from Seller, the
businesses and operations of Seller ("Transferred Businesses"); and

         WHEREAS, as soon as practicable following the closing of the
transactions contemplated under the Purchase Agreement, OMG wishes to sell,
transfer and assign to Ferro, and Ferro wishes to purchase and accept from OMG,
certain of the Transferred Businesses, including the rights and obligations of
OMG under the Purchase Agreement related to the Transferred Businesses sold to
Ferro;

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

         1. TRANSFER OF FERRO BUSINESSES.

         1.1 TRANSACTION STRUCTURE. The parties acknowledge that the Transferred
Businesses will be held by one or more limited partnerships or other legal
entities controlled by OMG and that Ferro wishes to acquire and to hold the
Ferro Businesses (as hereinafter defined) directly or through one or more
limited partnerships or other legal entities controlled by Ferro. Accordingly,
references to "OMG" and "Ferro" (and "party" or "parties," as appropriate)
throughout this Agreement shall include the affiliates actually holding or
intended to hold the Transferred Businesses if the context permits. The parties
further acknowledge that the transfer of the Ferro Businesses may be effected
through one or more transfers and closings (as opposed to one transfer) (the
closing of any transfer, a "Closing" and the date of any such closing, a
"Closing Date"). The parties will cooperate with each other in effecting such
multiple transfers, agreeing on tax-efficient structures for the transfers and
assignments contemplated hereunder, and entering into any additional contracts
necessary to reflect the details and specific agreements related to each
separate transaction or separate purchase agreements for the transfer of any one
or more of the "Ferro Businesses" as deemed necessary or appropriate by the
parties. Ferro will pay any taxes relating to the transfer of Ferro Businesses,
including capital gain taxes (provided that the assets were valued at fair
market value for purposes of the Purchase Agreement and provided that the total
fair market value allocated under the Purchase Agreement to the Ferro Businesses
is at least euros 600 million plus or minus the portion of any adjustment under
the Purchase Agreement allocable to the Ferro Businesses), VAT and real estate
transfer taxes.

         1.2 FERRO BUSINESSES. On the Closing Date, OMG shall sell and transfer
to Ferro, and Ferro shall purchase and accept from OMG, the portions of
Transferred Businesses described in

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EXHIBIT B hereto (each business being a "Ferro Business" and collectively,
"Ferro Businesses").

         1.3 RIGHTS AND OBLIGATIONS. Except as otherwise expressly provided
herein, it is the intention of the parties that the rights and obligations
obtained by OMG with respect to each Ferro Business through the Purchase
Agreement devolve to Ferro at each Closing, by legal assignment to the extent
permitted and contemplated by Section 18 of the Purchase Agreement or by
pass-through of such rights and obligations as contemplated by the Purchase
Agreement, as if the appropriate provisions of the Purchase Agreement were
repeated herein, and as if Ferro were the "Buyer" under the Purchase Agreement.
For the avoidance of doubt, such rights and obligations would include but not be
limited to:

                  (a) the right to rely on the representations and warranties of
         Seller set forth in Section 6 of the Purchase Agreement, as if such
         representations and warranties had been made directly by Seller to
         Ferro;

                  (b) the right to rely on the indemnification rights under
         Section 8 (Breach of Representations and Warranties), Section 9
         (Environmental Indemnity), and Section 10 (Contingent Liabilities) of
         the Purchase Agreement, as if such indemnification rights had been
         granted directly by Seller to Ferro;

                  (c) the unfunded pension liabilities of Seller allocable to
         the Ferro Businesses; and

                  (d) any other agreements or covenants made by, or benefits or
         burdens received by, OMG with respect to the Transferred Businesses
         that would apply to the Ferro Businesses, to the extent that such
         benefits can with OMG's reasonable efforts be obtained for or provided
         by OMG to Ferro; likewise Ferro will use its reasonable efforts to
         eliminate or ameliorate any detriments to OMG's business caused by the
         Ferro Businesses. In the event that Ferro requests OMG to enforce its
         rights under the Purchase Agreement to benefits related to the Ferro
         Businesses (for example, non-compete and non-solicitation provisions of
         Section 25 of the Purchase Agreement), Ferro will bear OMG's reasonable
         out-of-pocket expenses related thereto. With respect to Seller's duty
         to keep OMG informed and supply documents under Section 12 of the
         Purchase Agreement, OMG shall to the same extent keep Ferro informed
         from the date hereof; provided that no documents or information shall
         be provided to Ferro the receipt of which would be illegal under
         relevant antitrust laws or would cause OMG to breach the Purchase
         Agreement.

Ferro agrees that it will comply with any undertakings or limitations in the
Purchase Agreement to be imposed by OMG on any third party buyer of any of the
Transferred Businesses including without limitation the following:

                  (a) Ferro agrees that it will use the Degussa License (as
         defined in the Purchase Agreement) in accordance with and subject to
         the terms of Section 13.8 of the Purchase Agreement; and

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                  (b) Ferro agrees that it will occupy the Gutleut Area (as
         defined in the Purchase Agreement) in accordance with and subject to
         the terms of Section 13.12 of the Purchase Agreement.

         2. PURCHASE PRICE.

         2.1 PURCHASE PRICE. The base purchase price for the Ferro Businesses
shall be euros 600,000,000 ("Purchase Price"), allocated among the Ferro
Businesses as agreed by the parties. The Purchase Price will be converted into
an obligation to pay in US dollars based on the exchange rate published in the
Wall Street Journal on the next business day following the closing under the
Purchase Agreement.

         2.2 ADJUSTED PURCHASE PRICE. The Purchase Price will be adjusted as
follows:

                  (a) The Purchase Price will be adjusted as of the closing
         under the Purchase Agreement, determined consistently with the
         adjustment approach under the Purchase Agreement, but in relation to
         the Ferro Businesses only, in a manner to be agreed by the parties in
         order to reach a fair result to both OMG and Ferro.

                  (b) The Purchase Price payments will be adjusted ratably
         downward, based on the allocation of the Purchase Price on Exhibit B as
         the transfer of each Ferro Business is closed or separately sold.

                  (c) The Parties agree that time is of the essence to close the
         transactions described in this Agreement. As an incentive, the Purchase
         Price will be adjusted upward by $4,050,000 for each month from the
         closing under the Purchase Agreement to the last Closing under this
         Agreement. The adjustment will be prorated for any partial month and
         will be prorated among the Ferro Businesses and reduced for each Ferro
         Business that is closed or separately sold.

                  (d) The Parties agree to adjust the Purchase Price according
         to a formula and with limitations to be mutually agreed upon in order
         to share in any excess investment banking fees and other structural
         costs arising from the transaction described in this Agreement.

         OMG agrees that any purchase price allocation to be agreed between OMG
and Seller in accordance with Section 2.1 of the Purchase Agreement with respect
to the Ferro Businesses shall be subject to Ferro's prior approval, which
approval shall not be unreasonably withheld, conditioned or delayed.

         3. REPRESENTATIONS AND WARRANTIES. Each of OMG and Ferro represents and
warrants to the other that the following statements are true, accurate and
complete as of the date hereof and as of the Closing Date and any other party
acting as the nominee of OMG or Ferro represents to OMG or Ferro, respectively,
that the following statements are true as of the Closing Date:

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         3.1 ORGANIZATION, EXISTENCE, AND STANDING. It is a corporation or other
specified entity duly organized, validly existing, and in good standing under
the laws of Ohio, in the case of Ferro, or Delaware, in the case of OMG, or
other specified jurisdiction.

         3.2 POWER AND AUTHORITY. In the case of OMG and Ferro, it has full
corporate power, authority, and legal right to execute and deliver this
Agreement and to perform its obligations under this Agreement. Upon execution
and delivery by it, this Agreement and the other instruments and agreements for
which provision is made herein will (assuming the valid execution and delivery
by the other party of this Agreement and the other instruments and agreements
for which provision is made herein) constitute a valid and binding obligation of
it enforceable against it in accordance with their respective terms, except as
such enforceability may be limited by bankruptcy, insolvency, fraudulent
conveyance, moratorium, reorganization or similar laws affecting creditors'
rights generally or by general equitable principles (whether considered at law
or in equity). In the case of a nominee of OMG or Ferro, it has the full power
and authority and legal right to execute and deliver any additional documents
contemplated under Section 1 hereof and to close the relevant transaction.

         4. REPRESENTATIONS AND WARRANTIES. OMG hereby makes such
representations and warranties to Ferro with respect to the Ferro Businesses as
were made to OMG by Seller in the Purchase Agreement. Ferro acknowledges that
OMG is making these representations and warranties only to the extent necessary
to make claims for indemnities or damages on behalf of Ferro under the Purchase
Agreement, and that OMG shall not itself have financial obligations to Ferro
therefor except to the extent provided in Sections 5.1 and 5.13 hereof.

         5. COVENANTS BY PARTIES.

         5.1 PROCESSING OF INDEMNITY CLAIMS. OMG agrees that, following any
Closing Date and subject to the provisions set forth below and in the Purchase
Agreement, it will promptly submit any claims arising under representations,
warranties and indemnities under the Purchase Agreement received by OMG from
Ferro in writing and arising hereunder pursuant to Sections 1.3 and 4 relating
to the Ferro Businesses then owned by Ferro to Seller and Degussa, and that it
shall pursue such claims following the necessary procedures required under law
and under the Purchase Agreement, with all reasonable effort as they apply to
the Ferro Businesses; provided that OMG will be responsible for managing such
claims from a substantive point of view only to the extent required by the
Purchase Agreement and applying the same business judgment it would apply to
itself. Otherwise, Ferro will either provide the information and assistance
needed by OMG to effectively pursue such claim or it will manage the substantive
issues itself; provided that, Ferro shall not be required to manage any aspects
of any claim, procedurally or otherwise, if its participation would allow Seller
under the Purchase Agreement to deny responsibility for such claim on the basis
that OMG has assigned its rights in violation of the Purchase Agreement or some
other technical violation of the Purchase Agreement. OMG further agrees to
cooperate with Ferro in all reasonable ways to obtain any and all rights OMG
would be entitled to under the Purchase Agreement with respect to the Ferro
Businesses. Further, OMG shall appoint Ferro as its agent, with full authority
to pursue enforcement of OMG's rights under the Purchase Agreement. Each party
further agrees to provide the other party with a written notice describing the
nature and amount of any claim to be asserted against Seller or Degussa. The
parties shall

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agree prior to any Closing to the details of their respective roles under this
section. Any damages suffered by Ferro as a result of a breach by OMG of its
obligations under this Section 5.1 shall be limited to the amounts OMG would
have been entitled to recover under the Purchase Agreement had it not breached
its obligations under this Section 5.1.

         5.2 APPORTIONMENT OF BASKET AND CAP. The parties acknowledge that any
assertion of claims against Seller or Degussa with respect to the Transferred
Businesses retained by OMG or the Ferro Businesses is subject to the terms and
conditions set forth in the Purchase Agreement, which include the following
limitations: (i) any claim based on a breach of any representation or warranty
of Seller may be asserted against Seller or Degussa only if the total amount of
all claims asserted exceeds the amount of euros 10,000,000 ("Basket") and only
for the amount exceeding the Basket, and (ii) except for certain claims, all
claims based upon a breach of a representation or warranty or environmental
costs or liabilities is limited to an aggregate amount of 25% of the purchase
price paid by OMG for the Transferred Businesses ("Cap"). The parties agree that
the Basket and Cap shall be apportioned between Ferro and OMG as follows:

                  (a) the impact of the Basket limitation shall be equally
         shared by Ferro and OMG; so that, once the Basket amount has been
         reached, reimbursements from Seller shall be adjusted between OMG and
         Ferro until each of them has effectively contributed euros 5,000,000 to
         the basket.

                  (b) For so long as claims for the maximum payments under the
         Cap have not been made, Ferro and OMG shall have equal rights to the
         Cap. However, if claims under the Purchase Agreement exceed the Cap,
         during the period that Seller is obligated to pay indemnities, if
         either Ferro or OMG receives in excess of 50% of the Cap, the excess
         shall, unless the parties otherwise agree, be deposited in an escrow
         account, with terms to be agreed by OMG and Ferro, with distribution of
         such excess, together with interest earned thereon, to be made either
         at the end of the period to whichever of Ferro or OMG deposited the
         excess or prior to the end of the term as required to reimburse the
         other party as such party incurs indemnifiable expenses up to euros 150
         million.

         5.3 ENVIRONMENTAL CO-PAY. Ferro and OMG each agree that the party
claiming indemnification for environmental costs or liabilities shall be
required to pay the percentage of the total claim assigned to Buyer in Section
9.3.1 of the Purchase Agreement.

         5.4 CONTRACTS AND OTHER RIGHTS. OMG agrees to transfer (by way of legal
assignment if permitted or if not, by directing that the services be provided
for the relevant Ferro Business) to Ferro any intercompany service agreements
relating to the Ferro Businesses which will continue after the closing of the
Purchase Agreement in accordance with Section 13.11 of the Purchase Agreement.
OMG further agrees to use its reasonable efforts to cause the licensing party to
any SAP license or other material software license agreement relating to the
Ferro Businesses to consent to an assignment of such license agreement to Ferro
on any and all relevant Closing Dates. To the extent service agreements require
the cooperation of both OMG and Ferro, each will work to cause efficient and
effective results with the ultimate goal of separating the services supplied to
the individual businesses.

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         5.5 JOINT FACILITIES. The parties acknowledge that some of the
Transferred Businesses will be jointly operated by OMG and Ferro following the
Closing of any Ferro Business operating in a joint facility until such time as
it will be practicable to divide these jointly operated facilities between OMG
and Ferro. The parties shall agree on how these facilities shall be operated
and/or divided after each Closing on terms and conditions mutually satisfactory
to the parties.

         5.6 ANTITRUST CLEARANCE. Ferro agrees to comply with the restrictions
on Buyer under Section 13.10 of the Purchase Agreement. To the extent allowed by
such restrictions, on or before the closing of the transactions contemplated
under the Purchase Agreement, OMG and Ferro shall each promptly file or cause to
be filed with the Antitrust Authorities (as hereinafter defined) any
notifications required under any applicable antitrust law. The parties may agree
to file such notifications on a schedule consistent with the order in which they
intend to close the transfer of each Ferro Business.

                  (a) OMG and Ferro will assist and cooperate with each other in
         doing all things necessary, proper, or advisable to consummate and make
         effective, in the most expeditious manner practicable, the transactions
         contemplated in this Agreement, including (i) submitting all necessary
         notices and filings and (ii) obtaining all necessary consents,
         approvals, or waivers as required by the Antitrust Authorities (as
         hereinafter defined). The parties shall each cooperate and use their
         respective best efforts to promptly provide information and documents
         requested by any Antitrust Authority (including substantially complying
         with any second request for information pursuant to the
         Hart-Scott-Rodino Antitrust Improvements Act) or otherwise necessary,
         proper, or advisable to permit the consummation of the transactions
         contemplated hereby.

                  (b) OMG and Ferro also agree to promptly take any actions
         necessary, proper and advisable that would not have a materially
         adverse effect upon either OMG or Ferro to obtain the approval of any
         Antitrust Authority; provided that Ferro does agree to: (i) enter into
         negotiations with the relevant Antitrust Authority, or (ii) consent to
         reasonable third-party licenses or "non-bundling" restrictions if
         required by the relevant Antitrust Authority, in order to consummate
         the transactions contemplated herein as expeditiously as practicable.

                  (c) The parties shall promptly inform each other of any
         material communication from any Antitrust Authority. "Antitrust
         Authority(ies)" means the antitrust authorities of the European
         Commission, the United States and any other country having jurisdiction
         over the transactions contemplated herein. If any party hereto or any
         affiliate thereof receives a request for information or documents from
         any Antitrust Authority with respect to the transactions contemplated
         in this Agreement, then such party shall make, or cause to be made, as
         soon as practicable and after consultation with the other party, an
         appropriate response in compliance with such request and will make
         available for review to the other party (and its counsel) advance
         drafts of all presentations and filings in connection therewith. Each
         party shall consult the other party in advance of proffering any
         understandings, undertakings, or agreements (oral or written)

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         that it proposes to make or enter into with any other Antitrust
         Authority in connection with the transactions contemplated by this
         Agreement.

                  (d) If Ferro is unable to obtain the required approvals to buy
         any of the Ferro Businesses, or if both Ferro and OMG agree at any time
         that continuation of the process is impracticable, and if Ferro is
         allowed by the Antitrust Authorities to sell such Businesses, it will
         do so after providing OMG a right of first offer. If, on the other hand
         OMG sells such Businesses because a transfer to Ferro is not permitted
         or has been abandoned as described in the preceding sentence, such sale
         shall be for Ferro's account using an investment banker mutually
         acceptable to Ferro and OMG and Ferro and OMG will consult with each
         other about the appropriate sale process, and Ferro shall reimburse OMG
         for any net loss compared to the portion of the Purchase Price
         allocated to such Business on Exhibit B hereto. Similarly, any net gain
         received over the portion of the Purchase Price allocated to such Ferro
         Business shall be paid to Ferro. OMG and Ferro's rights to make a claim
         for net loss or net gain, as the case may be, and any portion remaining
         of the $4,050,000 monthly addition to the Purchase Price, shall expire
         at the earlier of OMG's decision to retain any business for its own
         account (as a result of Ferro's inability to obtain the required
         approvals to buy such business) and 270 days after OMG first has the
         right to sell the Ferro Business for Ferro's account. In the event OMG
         does decide to retain the business, the parties shall consider a fair
         adjustment of the monthly payments of additional purchase price,
         applying an offset against cash flow generated by the particular
         business since the closing under the Purchase Agreement.

         5.7 OPERATION OF FERRO BUSINESSES BEFORE CLOSING. After the closing of
the Purchase Agreement and prior to any and all Closings hereunder, OMG agrees
to maintain and operate the Ferro Businesses in a manner consistent with
Seller's past practices, including but not limited to preserving customer,
supplier and employee relations, performing contracts, maintaining operating
assets, and other actions necessary to maintain the value of the Ferro
Businesses. OMG also agrees that it will not do any of the following without the
prior written consent of Ferro: (a) enter into any intercompany supply
arrangements not consistent with Seller's past practice; (b) enter into any
significant long-term or "take or pay" supply agreements; (c) incur any capital
expenditures in excess of euros 1,000,000; (d) change Seller's practices used to
allocate costs among the Transferred Businesses that would affect the Ferro
Businesses; (e) enter into employment, "stay-put" or special bonus contracts or
arrangements with key employees not consistent with Seller's past practices; (f)
declare or pay any dividend to a direct or indirect parent or otherwise transfer
any profits from the Ferro Businesses; (g) sell or buy operating assets of the
Ferro Businesses outside the normal course of business, not consistent with past
practices; (h) take any other actions precluded by Section 14.1.2-14.1.9 of the
Purchase Agreement, or (i) waive its rights under Sections 14.1.2-14.1.9 of the
Purchase Agreement. OMG also agrees to allow Ferro to conduct reasonable
environmental due diligence; provided that such diligence shall not unreasonably
interfere with the relevant business operations. OMG also agrees to disclose to
Ferro in writing any violation of a representation, warranty or covenant under
the Purchase Agreement of which any executive officer of OMG becomes aware. The
Parties will work together to establish a separate accounting and treasury
mechanism to allow for the business results and cash flows to be tracked
separately.

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         5.8 FURTHER ASSURANCE. After the Closing, OMG shall from time to time,
at Ferro's reasonable request, execute and deliver to Ferro such other
instruments of conveyance or assignment, and take such other actions as Ferro
may reasonably request so as to more effectively assign and deliver and vest in
Ferro title to and possession of the Ferro Businesses and to fully implement
this Agreement.

         5.9 ACCESS. Prior to the closing under the Purchase Agreement, OMG
shall provide access to the Ferro Businesses consistent with Section 14.2 of the
Purchase Agreement, and Ferro shall use such information only as permitted by
Section 14.2 of the Purchase Agreement. Thereafter, prior to any Closing
hereunder, OMG shall provide senior management of Ferro and its agents
(including environmental consultants) with full access to the Ferro Businesses
and to the assets, operations, documents, books and records and information
relating to such businesses, to the extent necessary to enable Ferro to plan for
effective and efficient integration of those Businesses after they have been
transferred and shall furnish such other information as Ferro may reasonably
request. All information shall be provided pursuant to a confidentiality
agreement, and Ferro shall decline to receive any information that would be
precluded under applicable antitrust laws.

         5.10 FURTHER AGREEMENTS. OMG and Ferro acknowledge that this Agreement
does not purport to cover all legal and business issues related to the
transactions contemplated hereunder, and each agrees to negotiate and execute
additional agreements to achieve the goal of transferring the Ferro Businesses
on terms agreeable to both parties.

         5.11 THIRD-PARTY CONSENTS AND APPROVALS. OMG shall request Seller to
obtain any necessary third party consents relating to the Ferro Businesses in
accordance with Section 6.21 of the Purchase Agreement.

         5.12 OBLIGATION TO PURCHASE. No breach by OMG of its obligations
hereunder shall relieve Ferro from its obligation to purchase the Ferro
Businesses unless such breach is also a condition to close contained in Article
6.2 hereof.

         5.13 REIMBURSEMENT AND INDEMNITY OBLIGATIONS.

                  (a) OMG has undertaken obligations designed to provide the
         benefits of the Purchase Agreement to Ferro. OMG will indemnify and
         hold Ferro harmless from claims arising from OMG's breach of its
         obligations hereunder, but otherwise shall not be liable to Ferro for
         the obligations of Seller under the Purchase Agreement.

                  (b) Ferro, for its part, agrees to reimburse OMG for its
         reasonable out-of-pocket expenses incurred by OMG in securing the
         benefits under the Purchase Agreement for Ferro. In addition, Ferro
         will indemnify OMG and its affiliates from any third-party claims
         against them relating to the Ferro Businesses except that Ferro will
         not so indemnify OMG and its affiliates to the extent that such claims
         arise from events occurring during the ownership of the Ferro
         Businesses by OMG and result from a breach by OMG of its obligations
         under this Agreement, including, without limitation, OMG's obligations
         under Section 5.7.

                                       8
<PAGE>   9

         5.14 NO HIRE. Upon the sale of each Ferro Business, OMG will agree for
a period of two (2) years after the relevant Closing Date not to hire any
employee transferred with the Ferro Business; likewise, Ferro agrees for a
period of two (2) years after it has acquired any Ferro Business not to hire any
employee of the Transferred Businesses retained by OMG.

         6. CONDITIONS TO OBLIGATIONS OF PARTIES. The obligations of OMG to
consummate the transfer of each Ferro Business are subject to the satisfaction
on or prior to the Closing Date of the conditions set forth in Section 6.1. The
obligations of Ferro to consummate the transfer of each Ferro Business are
subject to the satisfaction on or prior to the Closing Date of the conditions
set forth in Section 6.2.

         6.1 OMG CLOSING CONDITIONS. The obligations of OMG to consummate the
transfer of each Ferro Business are subject to the satisfaction on or prior to
the Closing Date of the following conditions:

         (a) CLOSING OF PURCHASE AGREEMENT. OMG shall own the Ferro Businesses.

         (b) ANTITRUST CLEARANCE. All authorizations, consents, orders,
declarations, approvals, filings with, or terminations or expirations of waiting
periods imposed by, any governmental entity the failure of which to obtain, make
or occur would have the effect of making the transfer of the applicable Ferro
Business illegal or would have a material adverse effect on the transaction for
either party, shall have been obtained, shall have been made or shall have
occurred.

         (c) REPRESENTATIONS AND WARRANTIES TRUE ON CLOSING DATE. The
representations and warranties of Ferro made in Section 3 of this Agreement
shall be true in all material respects as of the Closing Date as though such
representations and warranties were made as of the Closing Date.

         (d) THREATENED OR PENDING PROCEEDINGS. No proceedings shall have been
threatened in writing or initiated (and not dismissed) by any governmental
authority seeking to enjoin or otherwise restrain the consummation of the
transactions contemplated hereby in any material respect.

         6.2 FERRO CLOSING CONDITIONS. The obligations of Ferro to consummate
the transfer of each Ferro Business are subject to the satisfaction on or prior
to the Closing Date of the following conditions:

         (a) CLOSING OF PURCHASE AGREEMENT. OMG shall beneficially own at least
the electronic materials businesses of Seller and shall not have sold any of the
Ferro Businesses to any other buyer except in accordance with the provisions of
this Agreement.

         (b) ANTITRUST CLEARANCE. All authorizations, consents, orders,
declarations, approvals, filings with, or terminations or expirations of waiting
periods imposed by, any governmental entity the failure of which to obtain, make
or occur would have the effect of making the transfer

                                       9
<PAGE>   10

of the applicable Ferro Business illegal or would have a material adverse effect
on the transaction for either party, shall have been obtained, shall have been
made or shall have occurred.

         (c) REPRESENTATIONS AND WARRANTIES TRUE ON CLOSING DATE. The
representations and warranties of OMG made in Section 3 of this Agreement shall
be true in all material respects as of the Closing Date as though such
representations and warranties were made as of the Closing Date.

         (d) THREATENED OR PENDING PROCEEDINGS. No proceedings shall have been
threatened in writing or initiated (and not dismissed) by any governmental
authority seeking to enjoin or otherwise restrain the consummation of the
transactions contemplated hereby in any material respect.

         (e) MATERIAL ADVERSE CHANGE. If OMG has the right to terminate the
Purchase Agreement under Section 4.3.2 thereof, and more than 50% of the adverse
change in financial condition referenced in Section 6.13.1 of the Purchase
Agreement applies to the Ferro Businesses, then Ferro shall have the right not
to close under this Agreement if (i) OMG knew prior to the closing under the
Purchase Agreement of its right to terminate the Purchase Agreement and notifies
Ferro of that right and (ii) Ferro notifies OMG prior to the closing under the
Purchase Agreement of its election not to close hereunder; provided that for
purposes of this condition, business trends of the Ferro Businesses at no worse
levels than known to Ferro at the date hereof shall not provide a basis for a
claim by Ferro that a Material Adverse Change has occurred.

         7. CLOSING.

         7.1 DATE AND TIME. The transactions contemplated by this Agreement will
take place five (5) business days after the condition set forth in Section 6.2
has occurred and all other conditions in Section 6 have been met, with respect
to each of the Ferro Businesses or at such other time and date as the parties
may agree in writing.

         7.2 PROCEDURES. If all of the conditions specified in Section 6 have
been fulfilled or are waived in writing by the parties on or by the Closing
Date, then, on the Closing Date, OMG will execute and deliver to Ferro, against
delivery of the Purchase Price for the relevant Ferro Business, the following:

                  (a) TRANSFER INSTRUMENTS. All conveyance and assignment
         instruments, certificates, bills of sale and documents determined by
         OMG and Ferro to be reasonably necessary to effect the transfer of the
         Ferro Business under applicable law;

                  (b) CERTIFICATES. Good standing, tax and other customary
         certificates or similar documents available under the jurisdictions of
         the respective Ferro Businesses as well as incumbency certificates of
         both OMG and Ferro.

                                       10
<PAGE>   11

                  (c) GUARANTEE. OMG and Ferro shall each guarantee to each
         other the obligations of any nominee transferring or accepting transfer
         of any Ferro Business hereunder.

         7.3 BREAKUP FEE. If the Purchase Agreement does not close for any
reason, and if OMG receives a "breakup fee" related thereto, OMG shall pay Ferro
50% of such fee.

         8. TERMINATION. If the parties are unable to obtain antitrust clearance
within seven months after the filing in jurisdictions that require mandatory
government pre-clearance notification processes of notices relating to a Ferro
Business to be transferred, then either party shall have the right to terminate
this Agreement with respect to such business by giving written notice to the
other party. For 90 days after either party has received such written notice,
Ferro shall have the right to sell the Ferro Business. If Ferro is unsuccessful,
OMG shall have the right to sell the Ferro Business. If a sale is executed in
either case, the economic adjustment required by Section 5.6(d) hereof shall
apply. In the event of any such termination, this Agreement will become void and
of no further force and effect with respect to such business and no party hereto
will have any liability to any other party hereunder (other than as provided in
this Section 8), with respect to such Ferro Business. This Agreement shall
remain in full force and effect with respect to any Ferro Businesses previously
transferred to Ferro. In the event Ferro does not purchase any Ferro Business,
Ferro agrees to keep confidential any information received in relation to such
business in accordance with its confidentiality agreements with Degussa and/or
Seller.

         9. EXPENSES. Whether or not the transactions contemplated hereby are
consummated, each of the parties hereto will pay, except as otherwise provided
herein, its respective expenses, income and other taxes, and costs (including
without limitation, the fees, disbursements, and expenses of its attorneys,
accountants, and consultants, except to the extent the parties agree to share
certain legal fees) incurred by it in negotiating, preparing, closing, and
carrying out this Agreement and the transactions contemplated by this Agreement.

         10. NOTICES. Notices hereunder will be effective when they are sent by
facsimile, with confirmation of receipt; one day after they are deposited with
an overnight courier; and three business days after they are deposited in the
official mails, postage prepaid, and, in each case, addressed:

                  (a)      In the case of OMG, to:

                           Mr. James M. Materna
                           Chief Financial Officer
                           OM Group, Inc.
                           3800 Terminal Tower
                           50 Public Square
                           Cleveland, Ohio 44113-2204
                           Fax No.: (216) 781-0902

                                       11
<PAGE>   12

                           With a copy to:

                           Carolyn J. Buller, Esq.
                           Squire, Sanders & Dempsey L.L.P.
                           4900 Key Tower
                           127 Public Square
                           Cleveland, Ohio  44114-1304
                           Fax No.:  (216) 479-8780

                  (b)      In the case of Ferro, to:

                           Mr. Bret W. Wise
                           Senior Vice President and Chief Financial Officer
                           Ferro Corporation
                           1000 Lakeside Avenue
                           Cleveland, Ohio 44114
                           Fax No.: (216) 875-7230

                           With a copy to:  Attn. General Counsel

All notices delivered hereunder shall be marked "PERSONAL AND CONFIDENTIAL." Any
party may change the address to which notices are to be addressed by giving the
other parties notice in the manner herein set forth.

         11. PUBLIC ANNOUNCEMENTS AND RELEASES. No party to this Agreement will
make or cause to be made any public announcement or release concerning this
Agreement or the transactions contemplated hereby without consultation with the
other parties to this Agreement, except that each party may make such
announcements or filings under the rules and regulations of the Securities and
Exchange Commission and New York Stock Exchange rules as may, on advice of
counsel, be required.

         12. GOVERNING LAW. The validity, interpretation, and performance of
this Agreement will be determined in accordance with the laws of the State of
Ohio.

         13. COUNTERPARTS. This Agreement may be executed in two or more
counterparts, each of which will be deemed an original, but all of which
together shall constitute but one and the same instrument.

         14. HEADINGS. The headings, subheadings, and captions in this Agreement
and in any exhibit hereto are for reference purposes only and are not intended
to affect the meaning or interpretation of this Agreement.

         15. EXHIBITS AND SCHEDULES. The exhibits and schedules attached hereto
and the other documents delivered pursuant hereto are hereby made a part of this
Agreement as if set forth in full herein.

                                       12
<PAGE>   13

         16. ENTIRE AGREEMENT. This Agreement contains the entire agreement
between the parties hereto with respect to its subject matter and supersedes all
negotiations, prior discussions, agreements, arrangements, and understandings,
written or oral, relating to the subject matter of this Agreement.

         17. SUCCESSORS AND ASSIGNS. This Agreement will be binding upon OMG and
Ferro and their respective successors and assigns. Notwithstanding the
immediately preceding sentence, each party may assign its rights and delegate
its duties under this Agreement to any of its subsidiaries or affiliated
companies.

         18. SEVERABILITY. If any provision of this Agreement is held to be
unenforceable, invalid, or void to any extent for any reason, that provision
shall remain in force and effect to the maximum extent allowable, if any, and
the enforceability and validity of the remaining provisions of this Agreement
shall not be affected thereby.

         19. EFFECTIVENESS OF AGREEMENT. The effectiveness of this Agreement
shall be subject to approval by the boards of OMG and Ferro, which the
undersigned will endeavor to obtain as soon as practicably possible.

         20. NO THIRD PARTY BENEFICIARIES. None of the parties hereto intends
that any person not a party hereto shall be a third-party beneficiary of any
provision of this Agreement and nothing contained herein shall be construed or
deemed to confer any benefit or right upon any third party.

                            [SIGNATURE PAGE FOLLOWS]

                                       13
<PAGE>   14

         IN WITNESS WHEREOF, each of the parties has caused this Agreement to be
duly executed and delivered as of the day and year first above written.

OM GROUP, INC.                        FERRO CORPORATION

By:                                   By:
    --------------------------           --------------------------------------
    Name:   James P. Mooney              Name:   Hector R. Ortino
    Title:  Chairman/CEO                 Title:  Chairman & Chief
                                                 Executive Officer

                                       14
<PAGE>   15

                                    EXHIBIT A

                               PURCHASE AGREEMENT

                                     BETWEEN

                     DMC2 DEGUSSA METALS CATALYSTS CERDEC AG
                                 HANAU, GERMANY

                                       AND

                                 OM GROUP, INC.
                              CLEVELAND, OHIO, USA

                                       AND

                                   DEGUSSA AG
                               DUSSELDORF, GERMANY

                                       15
<PAGE>   16

                                    EXHIBIT B

                              THE FERRO BUSINESSES

The Ferro Businesses shall consist of the following business divisions of the
Transferred Businesses:

a.       Electronic Materials ("EM");
b.       Performance Pigments and Colors ("PPC");
c.       Glass Systems ("GS"); and
d.       Cerdec Ceramics ("CER").

Prior to the closing of the transaction contemplated by the Purchase Agreement,
the parties shall agree to a detailed description of the assets that comprise
the Ferro Businesses, including the names of certain subsidiaries whose shares
will be transferred to Ferro.

The allocation of the Purchase Price for the Ferro Businesses shall be based on
the following grouping of the Ferro Businesses:

1.       Electronic Materials (100% of EM);
2.       Specialty Colors (approximately 15% of PPC and 100% of GS); and
3.       Ceramics and Glazes (approximately 85% of PPC and 100% of CER).

                                       16

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