4-amino-1,1'-azonaphthalene

Naphthalen-1-amine diazotization, and Naphthalen-1-amine coupling.

dark red light orange and brown. Soluble in ethanol, acetone and benzene. In concentrated sulfuric acid to red light brown, dilution after dark yellow, red brown precipitation; In concentrated sodium hydroxide solution insoluble. Used for oil, paraffin wax, cellulose and synthetic resin paint color.

Standard	Light Fastness	Heat-resistant(℃)		water	Sodium Carbonate(5%)	Hydrochloric acid(5%)
		Melting point	Stable
ISO	Poor	140-152	100≥ 100 Sublimation	Insoluble	No change	Turned purple