Definition - vat dye

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vat dye
  1. a dye that is applied by reducing the dye to a base-soluble form, applying the dye, then regenerating the insoluble dye by oxidation in the material; used for dyeing cotton
  2. 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