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                                                                   EXHIBIT 23.1

                        Consent of Independent Auditors

   We consent to the incorporation by reference in this Registration Statement
(Form S-8) pertaining to the OSCA Stock Compensation Plan of our report dated
February 21, 2001, with respect to the consolidated financial statements of
OSCA, Inc. included in its Annual Report (Form 10-K) for the year ended December
31, 2000, filed with the Securities and Exchange Commission.


                               Ernst & Young LLP
Indianapolis, Indiana
March 29, 2001