product name:4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid
Alias:C.I. 35570; 1-Naphthol-8-amino-3,6-disulfonic acid; H-Acid; H Acid; 1-Amino-8-Hydroxynaphthalene-3,6-Disulphonic Acid
CAS NO.:90-20-0
EINECS NO.:201-975-7
Molecular formula:C₁₀H₉NO₇S₂
MW:319.31
Molecular Structure:

Properties: pure product is colorless crystals, slightly soluble in water, soluble in alkaline solution of soda ash and caustic soda and the like. Ferric chloride solution with brownish red. Acid salt microstrip blue red fluorescence after alkali becomes purple color.
Usage: It is an important intermediate in the manufacture of dyes.