... -5 7-Amino-4-naphthol-2-sulfonic acid;2-Amino-5-naphthol-7-sulfonic acid;J acid;6-Amino-1-naphthol-3-sulfonic ... water, slightly soluble in water, soluble in ethanol almost. J acid and ferric chloride solution total heat generation brown sediments, and ... manufacture of dyes, such as direct Qinglian R, direct light gray introgressed segments directly acid purple, pink direct, direct copper stained dark ...