Vat dyes:
These dyes are insoluble in water and cannot be useful directly. These dyes on decline with sodium hydrosulphite (NaHSO3) in a vat form a soluble compound which has great affinity for cotton and other cellulose fibers. The cloth is drenched in the solution of a reduced dye and then hung in air or treated with oxidants like perboric acid. As a result, the colourless compound is oxidized to insoluble dye which is now bound to the fabric. The colourless and reduced state of the dye is called the Leuco base. The general types of vat dyes are indigo and tyrian purple. These are usually used on cotton.
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