Rockwood Press Release

For Immediate Distribution November 5, 2007

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Contact: Timothy McKenna tmckenna@rocksp.com Phone: 609-734-6430

Rockwood Announces Secondary Offering

Princeton, NJ USA (November 5, 2007) – Rockwood Holdings, Inc. (NYSE: ROC) announced today that it has commenced an offering to sell 10 million shares of its common stock owned by funds affiliated with Kohlberg Kravis Roberts & Co. L.P and DLJ Merchant Banking Partners III, as well as certain management stockholders.  The Company will not receive any proceeds from the offering.

To the extent that the underwriters sell more than 10 million shares of common stock, the underwriters have a 30-day option to purchase up to an additional 1.5 million shares from the selling stockholders.

The shares will be offered pursuant to an automatically effective registration statement filed today with the Securities and Exchange Commission.

Credit Suisse, Goldman, Sachs & Co., KKR Capital Markets and UBS Investment Bank are serving as joint book running managers of the offering. Lehman Brothers, First Analysis Securities Corporation and Deutsche Bank Securities are co-managers of the offering.

A prospectus relating to the offering may be obtained from:

• Credit Suisse Securities (USA) LLC, Prospectus Department, One Madison Avenue, New York, New York, 10010; and
• Goldman, Sachs & Co., Prospectus Department, 85 Broad Street, New York, New York, 10004, by facsimile at 212-902-9316, or by email at prospectus-ny@ny.email.gs.com

This press release shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of these securities in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state.

Rockwood Holdings, Inc. is a leading global specialty chemicals and advanced materials company. Rockwood has a worldwide employee base of approximately 9,500 people and annual net sales of approximately $3.0 billion. Rockwood focuses on global niche segments of the specialty chemicals, pigments and additives and advanced materials markets. For more information on Rockwood, please visit www.rocksp.com.

The information set forth in this press release contains certain "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995 concerning the business, operations and financial condition of Rockwood Holdings, Inc. and its subsidiaries and affiliates ("Rockwood"). Words such as "anticipates," "believes," "estimates," "expects," "forecasts," "predicts" and variations of such words or expressions are intended to identify forward-looking statements. Although Rockwood believes the expectations reflected in such forward-looking statements are based upon reasonable assumptions, there can be no assurance that its expectations will be realized. "Forward-looking statements" consist of all non-historical information, including any statements referring to the prospects and future performance of Rockwood. Actual results could differ materially from those projected in Rockwood's forward-looking statements due to numerous known and unknown risks and uncertainties, including, among other things, the "Risk Factors" described in Rockwood's 2006 Form 10-K on file with the Securities and Exchange Commission.  Rockwood does not undertake any obligation to publicly update any forward-looking statement to reflect events or circumstances after the date on which any such statement is made or to reflect the occurrence of unanticipated events.