By Hans de Jong and Jitte Flapper, Akzo Nobel Decorative Paints. The use of titanium dioxide in paints has been the topic of many discussions since the French authorities issued a proposal to classify it as Carcinogenic Category 1B [1]. This labelling would mean it could not be used in consumer paints in concentrations above 0.1%. It is alternatively possible that a Category 2 classification would be adopted, meaning that adverse product labelling (suspected of causing cancer) would be required for liquid paints containing more than 1%. For ...