Other Name: Acid Black S-RL,Acid Black LDN,Acid Black M-R,Acid Black S-DL,Neutral Black S-BL,Neutral Black 2S-RL,Neutral Black BR,Neutral Black D-SL,Neutral Black LD,Neutral Black M-SRL,Neutral Black RS-BLN,Neutral Complex Black S-RL,Neutral Complex Black LDN
Molecular Formula: C₄₀H₂₀CrN₆Na₃O₁₄S₂
Molecular Weight:  993.71
Manufacturing Methods : 4-Amino-3-hydroxynaphthalene-1-sulfonic aciddiazo, and Naphthalen-2-ol coupling, and then translate into 1:2 chromium complex.
Properties and Applications: black. Dark brown powder, soluble in water. Used for wool, polyamide fiber, silk and their blended fabric dyeing and printing directly, also can used for leather dyeing.