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Definition of Vat dye
1. 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.
Definition of Vat dye
1. 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 ¹
¹ Source: wiktionary.com