2-[3-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)prop-1-enyl]-1,3,3-trimethyl-3H-indolium chloride

Basic Red 12 is useful in colouring compositions for colour filters.

(a) 2-(1,3,3-Trimethylindolin-2-yl)acetaldehyde?and Formic acid?in acetic anhydride, in the presence of magnesium oxide for condensation reaction, and then to the water, salting out dyes; (b) 3-Methyl-1H-indole?and Chloromethane?reaction,and then to convert it into Trimethoxymethane dye.

Not classified

blue light pink. Red?violet?with?gray?powder . Easy to dissolve in water and ethanol peach_pink, also dissolve fiber element in. The strong sulfuric acid for yellow peach, diluted to blu-ray pink; In nitric acid for apricot yellow. With fluorescent dye water solution is pink, add sodium hydroxide into blue light pink. Used for silk, cotton, vinegar and polyamide fiber dyeing. Can also be used for leather, paper, shading, also used as organic pigments.

Standard( Silk )	Light Fastness	Persperation Fastness		Ironing Fastness		Soaping
		Fading	Stain	Fading	Stain	Fading	Stain
B	1-2					3-4	5