C.I. Direct Blue 166

2-Amino-5-(4-amino-3-hydroxyphenyl)phenol double nitriding, in alkaline conditions and 7-Amino-4-hydroxynaphthalene-2-sulfonic acid (2 Moore) coupled.

bright blue. Soluble in water for Red violet color. The strong sulfuric acid in blue, diluted for purple; Add 10% sodium bicarbonate solution for red jade.

Standard	Acid Resistance	Alkali Resistance	Light Fastness	Soaping		Water
				Fading	Stain	Fading	Stain
ISO	2	4-5	6	4		5
AATCC	2	4-5	5-6	3		5