2052-25-7

3-Amino-4-hydroxybenzenesulfonic acid diazotization, and Naphthalene-1,5-diol coupling.

Nonflammable

black. Soluble in water for bordeaux red, right amount soluble in ethanol and Cellosolve (for product red), slightly soluble in Acetone. In concentrated sulfuric acid for purple brown to black, diluted into wine red; In concentrated nitric acid for the red light brown, then shallow. Dye aqueous solution to join concentrated hydrochloric acid for wine red; Join concentrated sodium hydroxide solution for red wine. Mainly used for wool, silk, nylon dyeing, but also can be used in the electrochemical aluminum, leather tinting.

Standard	Ironing Fastness	Light Fastness	Fulling		Persperation Fastness	Soaping	Water
			Alkali	Acid
ISO	4	8	5	4	5	5	5
AATCC	5	7	5		5	5	5