Definitions for vat dye
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Random House Webster's College Dictionary
vat′ dye`(n.)
any of a class of water-insoluble dyes that are taken up by textile fibers and then fixed by oxidation.
Category: Chemistry
Origin of vat dye:
1900–05
Princeton's WordNet
vat dye, 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
Wiktionary
vat dye(Noun)
Any of a type of dye, many based on indigo, in which a soluble form is used to impregnate a fibre or fabric and is then converted to an insoluble form
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