Synonyms: 1,5-Naphthalenedisulfonicacid, 3,3'-[carbonylbis[imino(2-methyl-4,1-phenylene)azo]]bis-, compd. with 2,2'-(methylimino)bis[ethanol] (1:4)(9CI); Ethanol, 2,2'-(methylimino)bis-,3,3'-[carbonylbis[imino(2-methyl-4,1-phenylene)azo]]bis[1,5-naphthalenedisulfonate](4:1) (salt) (9CI)