<PAGE>
Exhibit 23.1
[Letterhead of Ernst & Young]
CONSENT OF INDEPENDENT AUDITORS
We consent to the reference to our firm under the caption "Experts" and to
the use of our reports (a) dated February 11, 2000, with respect to the
consolidated financial statements of OSCA, Inc., and (b) dated May 19, 2000,
with respect to the pro forma adjustments to the consolidated financial
statements of OSCA, Inc., in the Amendment No. 3 to Registration Statement
(Form S-1 No. 333-31956) and related Prospectus of OSCA, Inc. for the
registration of 6,440,000 shares of Class A common stock.
/s/ Ernst & Young LLP
Indianapolis, Indiana
June 6, 2000
