(6Z)-4-amino-6-[(4-nitrophenyl)hydrazinylidene]-5-oxo-3-(4-sulfophenyl)diazenyl-naphthalene-1-sulfonic acid

4-Aminobenzenesulfonic acid diazo in inorganic acid medium, and 4-Amino-5-hydroxynaphthalene-1-sulfonic acid coupling, and then 4-Nitrobenzenamine diazo again, and the generation of single accidentally coupled nitrogen compounds.

black. Soluble in water, slightly soluble in ethanol, very few soluble in acetone, insoluble in benzene. In the dark for the strong sulfuric acid, diluted for purple. Suitable for leather color.

Standard	Light Fastness	Soaping		Persperation Fastness	Oxygen bleaching		Fastness to seawater
		Fading	Stain		Fading	Stain	Fading	Stain
ISO	6	3		3-4	3	1	3-4
AATCC	8	1		1	5	3	4