aizen direct black bh; altazine black bh; Disodium 4-amino-5-hydroxy-6-({4'-[(2-hydroxy-8-sulfonato-1-naphthyl)diazenyl]-4-biphenylyl}diazenyl)-1-naphthalenesulfonate; 1-Naphthalenesulfonic acid, 4-amino-5-hydroxy-6-[2-[4'-[2-(2-hydroxy-8-sulfo-1-naphthalenyl)diazenyl][1,1'-biphenyl]-4-yl]diazenyl]-, sodium salt (1:2); Disodium 4-amino-5-hydroxy-6-({4'-[(2-hydroxy-8-sulfonato-1-naphthyl)diazenyl]biphenyl-4-yl}diazenyl)naphthalene-1-sulfonate
