Acid Yellow 158

2,4-Diaminobenzenesulfonic acid and 2,4,6-Trichloro-1,3,5-triazine condensation, and again 3-Aminobenzenesulfonic acid condensation, and then diazo, and 2,5-Bichloro-4-(3-methyl-5-oxo-4,5-dihydropyrazol-1-yl)benzenesulfonic acid coupling, and finally hydrolysis.

green light yellow. Yellow evenly powder, soluble in water, solubility than 50 g/L (50 ℃). Can be used for wool and polyamide fiber fabric dyeing.

Standard	Light Fastness	Soaping		Persperation Fastness	Oxygen bleaching		Fastness to seawater
		Fading	Stain		Fading	Stain	Fading	Stain
ISO	6	4	5	4-5	4	5	4-5	5