1-[(2-hydroxy-3,5-dinitrophenyl)azo]-2-naphthol

2-Amino-4,6-dinitrophenol diazotization, and Naphthalen-2-ol coupling.

blue light grey. Soluble in hot water for red brown, soluble in ethanol for brilliant purple, insoluble in benzene. In concentrated sulfuric acid to purple, red brown after dilution precipitation; In concentrated nitric acid for red solution, and then into a pale yellow; In concentrated hydrochloric acid in red brown precipitation.

Standard	Ironing Fastness	Light Fastness	Fulling		Persperation Fastness	Soaping	Water
			Alkali	Acid
ISO	4	5	4-5	4-5	4	5	5