6471-44-9

4-(4-Aminophenyl)benzenamine double nitriding, first in alkaline conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acidcoupling, again with phenol coupling, product to diazo, and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid diazo, and Benzene-1,3-diamine coupled to a product matches.

dark red light brown. Soluble in water for dark brown. The strong sulfuric acid for purple, diluted for brown. The dye solution to join strong hydrochloric acid darker precipitation; Join into the thick sodium hydroxide solution for brown

Standard	Acid Resistance	Alkali Resistance	Light Fastness	Soaping		Water
				Fading	Stain	Fading	Stain
ISO	4-5	4	2-3	3-4		3-4