Chromate(4-), [6-amino-3-[2-[5-(aminosulfonyl)-2-(hydroxy-κO)phenyl]diazenyl-κN1]-4-(hydroxy-κO)-2-naphthalenesulfonato(3-)][6-amino-4-(hydroxy-κO)-3-[2-[2-(hydroxy-κO)-5-nitro-3-sulfophenyl]diazenyl-κN1]-2-naphthalenesulfonato(4-)]-, potassium sodium