6227-19-6

1-Amino-2-naphthalene sulfonic aciddiazo, and 2-Amino-4-methylanisole coupling, its product to diazo, in alkaline conditions and 4-Hydroxy-7-(phenylamino)naphthalene-2-sulfonic acid coupling.

blue purple. For purple is soluble in water, soluble in ethanol for red light purple. The strong sulfuric acid for olive, diluted dark for. The dye solution to join strong hydrochloric acid have blue light green precipitation; Add thick sodium hydroxide solution has the purple precipitation.

Standard	Acid Resistance	Alkali Resistance	Light Fastness	Soaping		Water
				Fading	Stain	Fading	Stain
ISO	2	4-5	4	1-2		1-2