Benzenesulfonic acid, 4-hydroxy-3-[(2-hydroxy-5-methylphenyl)azo]-5-nitro-, monosodium salt

Preparation

3-Amino-4-hydroxy-5-nitrobenzenesulfonic acid diazotization, and p-Cresol coupling.

Properties and Applications

dark brown. Soluble in water for yellow brown, right amount soluble in ethanol. In concentrated sulfuric acid for yellow brown, dilution for shallow orange. Dye aqueous solution to join concentrated hydrochloric acid for orange; Join concentrated sodium hydroxide solution for orange brown.

Standard	Ironing Fastness	Light Fastness	Fulling		Persperation Fastness	Soaping	Water
			Alkali	Acid
ISO	4	5-6	3-4	3	5	4
AATCC	4	6	4		5	4