vat dye
noun
Definitions
Any of a class of dyes, 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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Definitions
Any of a class of dyes, 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.