.gamma.-Acid 2-Naphthalenesulfonic acid, 6-amino-4-hydroxy- 6-Amino-4-hydroxy-2-naphthalenesulfonic acid 6-Amino-4-hydroxy-2-naphthalenesulfonic acid (.gamma. acid) 90-51-7 Aminonaphthol sulfonic acid, .gamma.- C.I. Developer 3 NSC8630