Acid black 29

4-(4-Aminophenyl)benzenamine double nitriding, and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid?in acid conditions coupled; 2-Aminobenzenesulfonic acid diazo, in alkaline conditions to the above the products with coupling, and then in alkaline conditions and N-(3-hydroxyphenyl)-2-methyl-aniline?coupling.

black. Black powder, unfavorable discharge. Used for wool, silk dyeing and printing, also can be used for leather color.

Standard	Light Fastness	Soaping		Persperation Fastness	Oxygen bleaching		Fastness to seawater
		Fading	Stain		Fading	Stain	Fading	Stain
ISO	3	3-4	4-5	4-5	4-5	3	3-4