KRONOS WORLDWIDE, INC. ANNOUNCES A PRICE INCREASE FOR ALL

TITANIUM DIOXIDE PRODUCTS SOLD IN NORTH AMERICA

CRANBURY, NEW JERSEY – December 9, 2009 – Kronos Worldwide, Inc. (NYSE:  KRO) today announced a price increase for all titanium dioxide grades sold in North America.

Effective January 1, 2010, as contracts permit, prices for all Kronos titanium dioxide grades sold in North America will be increased by US$0.06 per pound.

This is a new price increase announcement and is in addition to the US$0.05 price increase announcement made on September 16, 2009, which is currently being implemented.

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

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