Acid black 84 (C.I. 17560) Chromate(7-), bis[4-hydroxy-3-[(2-hydroxy- 5-nitro-3-sulfophenyl)azo]-6-[(sulfomethyl)amino ]-2-naphthalenesulfonato(5-)]-, hexasodium hydrogen hexasodium hydrogen bis[4-hydroxy-3-[(2-hydroxy-5-nitro-3-sulphophenyl)azo]-6-[(sulphomethyl)amino]naphthalene-2-sulphonato(5-)]chromate(7-) Chromate(7-), bis4-(hydroxy-.kappa.O)-3-2-(hydroxy-.kappa.O)-5-nitro-3-sulfophenylazo-.kappa.N1-6-(sulfomethyl)amino-2-naphthalenesulfonato(5-)-, hexasodium hydrogen C.I.ACIDBLACK84 Chromate, bis[4-hydroxy- 3-[(2-hydroxy-5-nitro-3-sulfophenyl)azo]-6-[(sulfomethyl)amino]-2-naphthalenesulfonato]-, hexasodium hydrogen C.I.17560 Acid Black 84