Synonyms: | 1-Naphthalenesulfonicacid, 8-(phenylazo)-5,5'-[1,4-naphthylenebis(azo)]di-, disodium salt (7CI,8CI);1-Naphthalenesulfonic acid,8-(phenylazo)-5-[[4-[(5-sulfo-1-naphthalenyl)azo]-1-naphthalenyl]azo]-,disodium salt (9CI); Suminol Milling Black DBX |