Chromate(3-), [3-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-2-hydroxy-5-nitrobenzenesulfonato(3-)][2-hydroxy-3-[[(2-hydroxyphenyl)methylene]amino]-5-nitrobenzenesulfonato(3-)-N3,O2,O3]-, trisodium