1-Naphthalenesulfonicacid, 3-hydroxy-4-[(2-hydroxy-1-naphthalenyl)azo]- (9CI); C.I. Mordant Black17, free acid (7CI); Solochrome Dark Blue B, free acid (6CI);1-(2-Hydroxynaphthylazo)-2-naphthol-4-sulfonic acid;1-[(2-Hydroxy-1-naphthyl)azo]-2-naphthol-4-sulfonic acid;3-Hydroxy-4-(2-hydroxy-1-naphthylazo)-1-naphthalenesulfonic acid; Calcon freeacid
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