Chromate, hydroxy[4-hydroxy-3-nitro-5-[(1,2,3,4-tetrahydro-2,4-dioxo-3-quinolinyl)azo]benzenesulfonato]-, sodium

Preparation

3-Amino-4-hydroxy-5-nitrobenzenesulfonic acid diazo, and Quinoline-2,4-diol coupling, and then in water solution and sulfuric acid chromium heating, in 125 ° C keep 2 hours to form chromium complex.

Properties and Applications

red. Soluble in water for purplish red color, not soluble in ethanol and acetone. The strong sulfuric acid to red light brown, diluted red for blue-ray. In water solution to join 10% of sulfuric acid slightly change to blue; With 10% of sodium hydroxide solution discoloration.

Standard	Light Fastness	Soaping		Persperation Fastness	Oxygen bleaching		Fastness to seawater
		Fading	Stain		Fading	Stain	Fading	Stain
ISO	6	3-4	4	3-4	2-3		3-4