1. 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, vat color]
WordNet (r) 3.0 (2006):
vat dye
n 1: 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, vat color]