CPC Subgroup
C09B 45/40 Chromium compounds
Full Title
Complex metal compounds of azo dyes > Preparation from compounds with —OH and —COOH adjacent in the same ring or in peri position > Chromium compounds
C09B 45/40 Complex metal compounds of azo dyes > Preparation from compounds with —OH and —COOH adjacent in the same ring or in peri position > Chromium compounds