1-Naphthalenesulfonic acid, 4-amino-5-hydroxy-6-(1-naphthalenylazo)-3-[(4-sulfophenyl)azo]-, disodium salt 2668-05-5 C.I. 20350 C.I. Acid Black 17 C.I. Acid Black 17, disodium salt NSC73415 Wool Black 6BG