C.I. Direct Brown 29

2-Methyl-5-nitrobenzenesulfonie acid from the condensed products and Benzene-1,4-diamine condensation. That was??2-Methyl-5-nitrobenzenesulfonie acid sodium hydroxide solution at reflux under heating together with?Benzene-1,4-diamine?, its molecular ratio is 2:1. Its product (C.I.Direct Orange 28, C.I. 40065) diazo, and 6-(Dimethylamino)-4-hydroxynaphthalene-2-sulfonic acid in alkaline conditions coupled.

brown. Soluble in water for yellow orange to brown, slightly soluble in soluble fiber element, insoluble in other organic solvents. The strong sulfuric acid for Violet, dilute precipitation after dark brown; In nitric acid partly dissolved for red light brown.

Standard	Acid Resistance	Alkali Resistance	Light Fastness	Soaping		Water
				Fading	Stain	Fading	Stain
ISO	1-2	4	2	3		2-3
AATCC	3	3	3	3		4