Vat Violet 18

2,5,7-Trichloro-3-pseudoindolone and 4-Methoxy-5,7-dichloro-3-thianaphthenone condensation.

brilliant blue purple. In concentrated sulfuric acid to blue light green, dilution after purple; In concentrated nitric acid for purple; In the basic insurance powder solution for yellow brown.

Standard	Ironing Fastness	Chlorine bleach	Light Fastness	Mercerized	Oxygen bleach	Soaping
						Fading	Stain
ISO		4	5	4-5