vat dye

noun Chemistry.
any of the class of insoluble dyes impregnated into textile fibers by reduction into soluble leuco bases that regenerate the insoluble dye on oxidation.

Origin:
1900–05

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World English Dictionary
vat dye
 
n
a dye, such as indigo, that is applied by first reducing it to its leuco base, which is soluble in alkali, and then regenerating the insoluble dye by oxidation in the fibres of the material
 
'vat-dyed
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

vat dye

any of a large class of water-insoluble dyes, such as indigo and the anthraquinone derivatives, that are used particularly on cellulosic fibres. The dye is applied in a soluble, reduced form to impregnate the fibre and then oxidized in the fibre back to its original insoluble form. Vat dyes are especially fast to light and washing. Brilliant colours can be obtained in most shades. Originated in medieval Europe, vat dyes were so named because of the vats used in the reduction of indigo plants through fermentation.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Each vat dye has its own optimum temperature and specific proportions of alkali and reducing agents for vatting.
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