1,5-Naphthalenedisulfonic acid, 3-[[4-[[4-[(4-amino-2,5-dimethylphenyl)azo]-6(or 7)-sulfo-1-naphthalenyl]azo]-1-naphthalenyl]azo]-, trisodium salt

Preparation

3-Aminonaphthalene-1,5-disulfonic acid diazo, and Naphthalen-1-amine coupling, product to diazo, and 5-Aminonaphthalene-2-sulfonic acid and 8-Aminonaphthalene-2-sulfonic acid coupling, again diazo, and 2,5-Dimethylbenzenamine coupling.

Properties and Applications

dark red light to dark purple light blue. Soluble in water for red light purple and blue, slightly soluble in alcohol. The strong sulfuric acid in the green light for black, diluted Dark violet color to brown for precipitation. The dye solution to join sulfuric acid 10% tiny change of blue; Add 10% sodium hydroxide solution for red light purple.

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