JANUS BLACK

Uses

Janus Black was used for the dyeing of polyacrylonitrile fibers.

Preparation

N, N-diethyl-phenosafranine diazo, coupled with phenol.

Properties and Applications

green and black. Soluble in water for dark green light blue, soluble in ethanol for red light blue. The strong sulfuric acid for green, diluted for purple, and a green precipitation. The dye solution to join hydrochloric acid soluble green precipitate generated; With strong sodium hydroxide solution generation red precipitate.

Standard	Light Fastness	Persperation Fastness		Ironing Fastness		Soaping
		Fading	Stain	Fading	Stain	Fading	Stain
AATCC	6	5	5	3-4		5	5

Forms and nomenclature

Janus Black R 17 is formed by coupling diazotized diethylphenosafranine to phenol.