Similar names: 1-Naphthol-3,6-disulfonic acid, 2,2'-(4,4'-biphenylylenebisazo)bis[8-amino-, tetrasodium salt (6CI); 2,7-Naphthalenedisulfonic acid, 3,3'-[[1,1'-biphenyl]-4,4'-diylbis(azo)]bis[5-amino-4-hydroxy-, tetrasodium salt (9CI); C.I. Direct Blue 6 (7CI); C.I. Direct Blue 6, tetrasodium salt (8CI); Airedale Blue 2BD; Aizen Direct Blue 2BH; Amanil Blue 2BX; Atlantic Blue 2B; Atul Direct Blue 2B; Azocard Blue 2B; Azomine Blue 2B; Belamine Blue 2B; Bencidal Blue 2B; Benzanil Blue 2B; Benzo Blue 2B; Benzo Blue BBA-CF; Benzo Blue BBN-CF; Benzo Blue GS; Blue 2B; Blue 2B salt; Brasilamina Blue 2B; C.I. 22610; Calcomine Blue 2B; Chloramine Blue 2B; Chlorazol Blue B; Chlorazol Blue BP; Chrome Leather Blue 2B; Cresotine Blue 2B; Diacotton Blue BB; Diamine Blue; Diamine Blue 2B; Diamine Blue BB; Diaphtamine Blue BB; Diazine Blue 2B; Diazol Blue 2B; Diphenyl Blue 2B; Diphenyl Blue KF; Diphenyl Blue M 2B; Direct Blue 2B; Direct Blue 2BA; Direct Blue 6; Direct Blue A; Direct Blue BB; Direct Blue GS; Direct Blue K; Direct Blue M 2B; Direct Sky Blue K; Enianil Blue 2BN; Fenamin Blue 2B; Fixanol Blue 2B; Hispamin Blue 2B; Indigo Blue 2B; Kayaku Direct Blue BB; Mitsui Direct Blue 2BN; Naphtamine Blue 2B; Niagara Blue 2B; Nippon Blue BB; Paramine Blue 2B; Phenamine Blue BB; Pheno Blue 2B; Pontamine Blue BB; Tertrodirect Blue 2B; Vondacel Blue 2B; 2,7-Naphthalenedisulfonic acid, 3,3'-[[1,1'-biphenyl]-4,4'-diylbis(2,1-diazenediyl)]bis[5-amino-4-hydroxy-, sodium salt (1:4) (ACI); Direct Blue 2b