Acid Yellow 33

6-Aminonaphthalene-1-sulfonic acid diazo, with Diphenylamine coupling, then use the sodium nitrate processing, generation N-and the nitro derivatives, and then to nitration (also useda mixture of 6-Aminonaphthalene-1-sulfonic acidand 8-Aminonaphthalene-1-sulfonic acid in place of 6-Aminonaphthalene-1-sulfonic acid).

red light yellow. Used for wool, silk, vinegar fiber dyeing. Tannin mordant dyeing can improve the wet process fastness.

Standard	Light Fastness	Soaping		Persperation Fastness	Oxygen bleaching		Fastness to seawater
		Fading	Stain		Fading	Stain	Fading	Stain
ISO	2	2	1-2	2	2		2