Production of pigments, e.g. for coloring paper or textiles, involves precipitation by mixing aqueous chitosan salt solution with an aqueous solution of a salt of a complex metal anion, e.g. potassium dichromate

摘要

A method for the production of pigments (I) involves precipitation of (I) by mixing (a) aqueous solutions of chitosan salts with (b) aqueous solutions of salts of complex metal anions.