Vat-dye meaning

A dye, such as indigo, that produces a fast color by impregnating fiber with a reduced soluble form that is then oxidized to an insoluble form.
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A colorfast dye made soluble for application to cloth, then oxidized and thus rendered insoluble in the cloth.
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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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