Vat Dyes

Vat Dyes
VAT DYES
Vat dyes are fast, especially to washing. They are called vat dyes because, being originally insoluble in water, they undergo special preparation in large vats, where they are made soluble by the action of caustic soda and hyposulphite. In this liquor the fabrics are treated. Certain other chemicals are added which change the dyestuff back to the insoluble form in the fibre. This is called the fixing process.

Dictionary of the English textile terms. 2014.

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  • Vat dye — Vat dyes are an ancient class of dyes, based on the natural dye, indigo, which is now produced synthetically. OverviewThe process vat dyeing refers to dyeing in a bucket or fat. It can be performed whenever a liquid, even shade over the entire… …   Wikipedia

  • vat dye — noun a water insoluble dye that is applied by reducing the dye to an alkaline form, applying the dye, then regenerating the insoluble dye by oxidation in the material; used for dyeing cotton • Syn: ↑vat color • Hypernyms: ↑dye, ↑dyestuff * * *… …   Useful english dictionary

  • vat dye — Chem. any of the class of insoluble dyes impregnated into textile fibers by reduction into soluble leuco bases that regenerate the insoluble dye on oxidation. [1900 05] * * * ▪ chemical compound       any of a large class of water insoluble dyes …   Universalium

  • vat-dyed — ˈ ̷ ̷| ̷ ̷ adjective : dyed with one or more vat dyes * * * vat dyed «VAT DYD», adjective. dyed with vat dyes: »vat dyed goods …   Useful english dictionary

  • vat color — noun a water insoluble dye that is applied by reducing the dye to an alkaline form, applying the dye, then regenerating the insoluble dye by oxidation in the material; used for dyeing cotton • Syn: ↑vat dye • Hypernyms: ↑dye, ↑dyestuff * * * noun …   Useful english dictionary

  • vat-dyed — adjective Date: 1946 dyed with one or more vat dyes …   New Collegiate Dictionary

  • vat dye — vat′ dye n. chem. any of a class of water insoluble dyes that are taken up by textile fibers and then fixed by oxidation • Etymology: 1900–05 …   From formal English to slang

  • vat dye — /ˈvæt daɪ/ (say vat duy) noun any of a group of insoluble dyes which are applied to fabrics by first reducing them to alkali soluble leuco bases. After dyeing, the insoluble dye is regenerated in the fibres of the material by oxidisation …  

  • List of dyes — This article is a list of chemical dyes. For natural dyestuffs, see Glossary of dyeing terms. List of dyes with Colour Index International generic names and numbers. Common name Synonyms C.I. generic name C.I. number Alcian yellow GXS Sudan… …   Wikipedia

  • Fibres and Dyes — ▪ Table fibres application classes Natural fibres Animal Wool acid, basic, mordant, reactive, (solubilized vat) Wool blends (wool cotton, acid, direct, mordant, reactive wool viscose, etc.) Silk acid, basic, direct, mordant, (reactive) …   Universalium

  • dye — dyable, dyeable, adj. dyer, n. /duy/, n., v., dyed, dyeing. n. 1. a coloring material or matter. 2. a liquid containing coloring matter, for imparting a particular hue to cloth, paper, etc. 3. color or hue, esp. as produced by dyeing. 4. of the… …   Universalium

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