Other Name: Weak Acid Black N-BG, Weak Acid Black NB-G, Acid Black 2BNG, Acid Black NE
Molecular Formula: C₃₄H₂₆N₁₀Na₂O₉S₃
Molecular Weight: 860.81
Manufacturing Methods : 4-Amino-N-(4-aminophenyl)benzenesulfonamidedouble nitriding,sulfonylurea aniline in acid conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acidcoupling, aniline diazo, and the above the products in alkaline conditions coupling, and then Benzene-1,3-diamine coupled.
Properties and Applications:  black. Mainly used for wool, silk, cotton and glue dyeing, also can be used for leather dyeing.