Syonyms Name: C.I. 20470; C.I. Acid Black 1; C.I. Acid Black 1, disodium salt; C.I. Acid Black 1 (7CI); C.I. Acid Black 1, disodium salt (8CI); 4-Amino-5-hydroxy-3-(p-nitrophenylazo)-6-(phenylazo)-2,7-naphthalenedisulfonic aci; Amido Schwarz; Aniline Blue Black; Acid B