1-Naphthalenesulfonic acid, 4-amino-5-hydroxy-6-[(4-nitrophenyl)azo]-3-[(4-sulfophenyl)azo]-, disodium salt 5863-90-1 Acid Leather Black IRW Acilan Hat Black GR C.I. 20345 C.I. Acid Black 16 C.I. Acid Black 16, disodium salt NSC47725 Wool Black GR