1-Naphthalenesulfonic acid, 6-(3-chloro-2-hydroxy-5-nitrophenyl)azo-5-hydroxy-, monosodium salt, mixt. with 4-4-(3-chloro-2-hydroxy-5-nitrophenyl)azo-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-ylbenzenesulfonic acid monosodium salt
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