Nacreous pigments and process for the production thereof

摘要

Golden colored nacreous pigments are produced from mica flakes coated with a layer of TiO2 and/or ZrO2 by a process comprising the precipitation of an iron hydroxide thereon from an aqueous iron salt solution by precipitating the iron hydroxide at a pH of above 5 from an aqeous ferrous salt solution and thereafter converting the thus-precipitated layer of iron hydroxide on the coated mica flakes to Fe2O3.