4-[[4-[(2,4-Dinitrophenyl)amino]phenyl]azo]benzenesulfonic acid sodium salt

(a) 4-((4-Aminophenyl)diazenyl)benzenesulfonic acid?and 1-Chloro-2,4-dinitrobenzene?condensation;

red light yellow. Soluble in water for orange. The strong sulfuric acid for blue-ray red, diluted for red, and then into a orange solution and the emergence of precipitation. Its water solution with hydrochloric acid appears orange brown precipitation; Add sodium hydroxide for darker brown. Can be used for wool, silk dyeing and printing.

Standard	Light Fastness	Soaping		Persperation Fastness	Oxygen bleaching		Fastness to seawater
		Fading	Stain		Fading	Stain	Fading	Stain
ISO	3	2		2	1		2