Synonyms: 2,7-Naphthalenedisulfonicacid,5-amino-3-[[4'-[[2,6-diamino-3-[(2,4-diamino-5-methylphenyl)methyl]-5-methylphenyl]azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-4-hydroxy-,disodium salt (9CI); 2,7-Naphthalenedisulfonic acid,5-amino-3-[[4'-[[2,6-diamino-a3-(4,6-diamino-m-tolyl)-3,5-xylyl]azo]-3,3'-dimethyl-4-biphenylyl]azo]-4-hydroxy-,disodium salt (8CI); C.I. 23390; Toluylene Black Blue RO