Benzenesulfonic acid, 2-[[2-(methylamino)-1-naphthalenyl]azo]-5-nitro-, monosodium salt

Preparation

2,5-Diaminobenzenesulfonic acid diazo, and N-methylnaphthalen-2-amine?coupling.

Properties and Applications

dark purple. Soluble in water for purple, also soluble in ethanol, acetone, insoluble in benzene. The strong sulfuric acid is palm in light orange; After dilute for dark pink. In the dye solution to join strong hydrochloric acid with brown precipitation; Add thick sodium hydroxide solution has the purple precipitation

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