2-Naphthalenesulfonic acid, 6-amino-3-[[4-[[4-amino-6(or 7)-sulfo-1-naphthalenyl]azo]-1-naphthalenyl]azo]-4-hydroxy-, disodium salt

Preparation

5-Acetamido-8-amino-2-naphthalenesulfonic acid ?diazo, and Naphthalen-1-amine coupling, product to diazo, in alkaline conditions and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid? coupling, and then hydrolysis acetyl amino.

Properties and Applications

green light navy blue. Soluble in water for blue, slightly soluble in ethanol and soluble fiber element. The strong sulfuric acid in the green light for black, dark blue purple for diluted; In the nitric acid for brown; In strong hydrochloric acid slightly soluble in for black. The dye solution to join strong hydrochloric acid have red light blue precipitation; Add sodium hydroxide have red light purple precipitation.

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