CORUNDUM CRYSTAL STRUCTURE PIGMENTS WITH REDUCED SOLUBLE CHROMIUM CONTENT

摘要

The potential for release of soluble chromium (VI) ions in the production or processing of certain pigments is reduced by use of certain additives. The additives include aluminum metaphosphate, aluminum fluoride, tungsten oxide, tungstic acid, and mono-ammonium phosphate. The pigments are those which contain chromium and have a corundum crystal structure.