Acid Blue #9
Acid Blue 9 is a colourant, or dye. It is one of the most widely used and tested dyes in consumer products, and it can be found in clothing and coloured paper. We add dyes to products for a variety of reasons including helping you see where you applied the product, when a product is used up, or for aesthetic reasons. This dye is available from multiple suppliers, which are responsible for its contents.