... -5 7-Amino-4-naphthol-2-sulfonic acid;2-Amino-5-naphthol-7-sulfonic acid;J acid; CAS NO : 87-02-5 7-Amino ... -4-naphthol-2-sulfonic acid;2-Amino-5-naphthol-7-sulfonic acid;J acid;6 ... cold water, slightly soluble in water, soluble in ethanol almost. J acid and ferric chloride solution total heat generation brown sediments, and ...