Vat Dye

Name:
Vat Dye
Detailed information:
A class of water-insoluble dyes that can be easily reduced, i.e., vatted to a water-soluble and usually colorless leuco form in which they can readily impregnate fibers. Subsequent oxidation then produces the insoluble colored form that is remarkably fast to washing, light, and chemicals. Examples are indigo (CI 73000) and Indanthrene Blue BFP (CI 69825). The reducing agents are usually an alkaline solution of sodium hydrosulfite (Na₂S₂O₄). Oxidation is by air, perborate, dichromate, etc.

Use:

For cotton, wool, and cellulose acetate.