Synonyms: disodium [2-(2-chlorophenyl)-2,4-dihydro-4-[(2-hydroxy-5-nitrophenyl)azo]-5-methyl-3H-pyrazol-3-onato(2-)][2-hydroxy-3-[(2-hydroxy-1-naphthyl)azo]-5-nitrobenzene-1-sulphonato(3-)]chromate(2-);Chromate(2-), 2-(2-chlorophenyl)-2,4-dihydro-4-2-(hydroxy-.kappa.O)-5-nitrophenylazo-.kappa.N1-5-methyl-3H-pyrazol-3-onato(2-)-.kappa.O32-(hydroxy-.kappa.O)-3-2-(hydroxy-.kappa.O)-1-naphthalenylazo-.kappa.N1-5-nitrobenzenesulfonato(3-)-, disodium;Chromate(2-), [2-(2-chlorophenyl)-2,4-dihydro-4-[(2-hydroxy-5-nitrophenyl)azo]-5-methyl-3H-pyrazol-3-onato (2-)][2-hydroxy-3-[(2-hydroxy-1-naphthalenyl)azo]-5-nitrobenzenesulfonato(3-)]-, disodium