sodium 4-hydroxy-5-[(2-methoxy-4-nitrophenyl)azo]-6-(phenylamino)naphthalene-2-sulphonate

2-Methoxy-4-nitrobenzenamine diazo, in acid conditions and 4-Hydroxy-6-(phenylamino)naphthalene-2-sulfonic acid coupling.

blue and black. Blue-ray black powder. Soluble in water for purple to blue-black, soluble in ethanol for purple. The strong sulfuric acid are purple to blue-black, a grey purple diluted. Its water solution and strong hydrochloric acid for violet black; Add thick as a hydrogen oxidation solution tresses. Mainly used for wool fabric and wool/rayon blended fabric dyeing, pitch-black degree good, high fastness. Also used in leather dyeing.

Standard	Light Fastness	Soaping		Persperation Fastness	Oxygen bleaching		Fastness to seawater
		Fading	Stain		Fading	Stain	Fading	Stain
ISO	6	3	3	4	2		4-5
AATCC	6	3-4	3-4	4-5	1		4-5