This product is white or gray acicular crystals, usually containing half a molecule of water of crystallization, turns pink in air, more so when wet, alkali solution oxidizes to brown quickly in air, neutral solution shows slightly blue fluorescence. Slightly soluble in water, soluble in alkali

Chinese alias：1,2-重氮氧基-4-萘磺酸 （氧体）

English alias：1-Diazo-2-naphthol-4-sulfonic acid

Mainly used in the preparation of acid dye and mordant dye intermediates, can synthesize acid mordant dyes, azo dyes, dichromate dyes and nitro diazo oxides

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