KRONOS WORLDWIDE, INC.                           Contact:   H. Joseph Maas
Three Lincoln Centre                                        President, Sales and
5430 LBJ Freeway, Suite 1700                                  Marketing
Dallas, Texas   75240-2697                                  (609) 860-6200
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PRESS RELEASE
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FOR IMMEDIATE RELEASE


     KRONOS WORLDWIDE, INC. ANNOUNCES PRICE INCREASES FOR TITANIUM DIOXIDE
                       PRODUCTS IN ALL MARKETS WORLDWIDE


         CRANBURY,  NEW JERSEY - March 15, 2005 - Kronos Worldwide,  Inc. (NYSE:
KRO) today announced price increases for all Kronos titanium dioxide grades sold
in all markets worldwide.

         Effective  April 1, 2005,  or as permitted by contract,  prices for all
Kronos products will increase as follows:

        o     In the United States, by U.S. $0.05 per pound.
        o     In Canada, by C $0.06 per pound.
        o     In Europe, by (euro)100 per metric ton.
        o     In Eastern Europe, by U.S. $150 per metric ton.
        o     In the Middle East and Africa, by U.S. $150 per metric ton.
        o     In South and Central America, by U.S. $150 per metric ton.
        o     In Asia Pacific, by U.S. $150 per metric ton.

These price increases follow the December 2004 and January 2005 increases on all
Kronos titanium dioxide grades, which are expected to be fully implemented by
April 1, 2005.

         Kronos Worldwide,  Inc. is a major  international  producer of titanium
dioxide pigments.

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