Synonyms: 1-Naphthol-3,6-disulfonicacid, 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-, tetrasodiumsalt (9CI);C.I. Direct Blue 6, tetrasodium salt(8CI);Airedale Blue 2BD;Aizen Direct Blue 2BH;Amanil Blue 2BX;Atlantic Blue2B;Atul Direct Blue 2B;Azocard Blue 2B;Azomine Blue 2B;Belamine Blue 2B;Bencidal Blue 2B;Benzanil Blue 2B;Benzo Blue 2B;BenzoBlue BBN-CF;Blue 2B salt;Calcomine Blue 2B;Chloramine Blue 2B;Chlorazol BlueBP;Chrome Leather Blue 2B;Cresotine Blue 2B;Diamine Blue;Diamine Blue 2B;Diamine Blue BB;DiazolBlue 2B;Diphenyl Blue 2B;Direct Blue2B;Direct Blue 2BA;Direct Blue A;Direct BlueGS;Direct Blue K;Direct Sky Blue K;Enianil Blue 2BN;Fixanol Blue 2B;Hispamin Blue 2B;Naphtamine Blue 2B;Niagara Blue 2B;Nippon Blue BB;Paramine Blue 2B;Phenamine Blue BB;Pheno Blue 2B;Tertrodirect Blue 2B;Vondacel Blue 2B;