6227-16-3

2-Amino-5-nitrobenzenesulfonic acid diazo, and 2-Amino-4-methylanisole coupling, product to diazo, in alkaline conditions and 4-Hydroxy-7-(phenylamino)naphthalene-2-sulfonic acid coupling, then use the method will be reduced to amino nitro.

blue. Soluble in water for purple, slightly soluble in alcohol. The strong sulfuric acid for blue, purple precipitation after diluted. The dye solution to join strong hydrochloric acid have blue purple precipitation; Add thick sodium hydroxide solution have dark purple precipitation.

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