1-NAPHTHALENESULFONIC ACID, 4-HYDROXY-3-((4'-((1-HYDROXY-5-SULFO-2-NAPHTHALENYL) 1-Naphthalenesulfonic acid, 4-hydroxy-3-((4'-((1-hydroxy-5-sulfo-2-naphthalenyl)azo)-3,3'-dimethyl(1,1'-bip henyl)-4-yl)azo)-, disodium salt 1-Naphthalenesulfonic acid, 4-hydroxy-3-((4'-((1-hydroxy-5-sulfo-2-naphthalenyl)azo)-3,3'-dimethyl(1,1'-biphenyl)-4-yl)azo)-, disodium salt 6420-06-0 Azo Blue C.I. 23685 C.I. Direct Violet 28 C.I. Direct Violet 28, disodium salt