Vat Dyes


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Related to Vat Dyes: Reactive dyes, Disperse Dyes

Vat Dyes

 

one of the most important groups of dyes. They are insoluble in water. Vat dyes contain carbonyl groups, which are reduced to the enol form Vat Dyes by hydrosulfite, Na2S2O4, during the dyeing process. The resulting soluble leuco compounds of the vat dyes are absorbed by the substrate (for example, cellulose fiber) and converted into the original insoluble vat dyes during subsequent oxidation upon exposure to air. Vat dyes are classified according to chemical structure as polycyclic, indigoid, and thioindigoid. They are manufactured in all colors except bright red. Polycyclic vat dyes are very durable and are widely used in the textile industry for dyeing cellulose fibers; they also serve as pigments.

References in periodicals archive ?
Different concentrations of [H.sub.2][O.sub.2] (0.2 to 1.6 mM) were also used to make assay for the decolourization of Vat dyes using garlic peroxidase.
The selection of the type of semiconductor is based on its ability to convert the vat dyes into nontoxic products [44, 90,177,178].
The use of the function proVAT is recommended for dyeing cotton with vat dyes. This special feature prevents the penetration of atmospheric oxygen so that the use of hydraulic and brine can be optimized.
Open width stable continuous dyeing of cotton, linen and their blends through disperse, reactive, vat dyes, etc.
Some of these dyes are- Acid (Anionic) dyes, Basic (Cationic) dyes, Neutral - Premetalized dyes, sulfur dyes, vat dyes, reactive dyes, pigment dyes, etc.
Vat dyes are popular for all shades in Europe, e.g.