C.I. Direct orange 25

Preparation

4-(4-Aminophenyl)benzenamine double nitriding, respectively with the 4-Hydroxynaphthalene-1-sulfonic acid and o-Cresol coupling.

Properties and Applications

red light orange. Moderate soluble in water for orange brown, slightly soluble in ethanol for gold orange. In the dark for the strong sulfuric acid, diluted for dark purple. The dye solution to join strong hydrochloric acid for violet black, precipitation; Add thick sodium hydroxide solution for yellow orange brown.

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