sodium 5-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-4-hydroxytoluene-3-sulphonate

Preparation

2-Hydroxy-3-amino-5-methylbenzenesulfonic acid?diazotization, and 3-Methyl-1-phenyl-1H-pyrazol-5(4H)-one coupling.

Properties and Applications

dark yellow red. Dark yellow red powder. Soluble in water for yellow brown. In concentrated sulfuric acid for orange red, after diluted into yellow orange, precipitation, In concentrated hydrochloric acid for yellow brown, precipitation. Dye aqueous solution to join sodium hydroxide as yellow. Mainly used for wool, silk, nylon of post-mordant dyeing, also used for cobalt medium printing.

Standard	Ironing Fastness	Light Fastness	Fulling		Persperation Fastness	Soaping	Water
			Alkali	Acid
ISO	5	6-7	4-5	4	5	4-5	5
AATCC	3	6	3-4		4-5