Direct Blue 157

Подготовка

2′-Methoxy-4′-amino-5′-chlorooxanilic acid diazo, and 5-Aminonaphthalene-2-sulfonic acid coupling, product to diazo, and 7-Hydroxynaphthalene-2-sulfonic acid coupling, and then 2-(4-Aminophenylamino)-2-oxoacetic acid hydrolysis base, again diazo, and 4,5Dihydroxynaphthalene-1-sulfonic acid coupling.

Свойства и приложения

dark blue. Soluble in water for blue, soluble in ethanol. concentrated sulfuric acid in olive green, diluted to blue. The dye solution with strong hydrochloric acid blue precipitation; Add thick dark for sodium hydroxide solution.

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