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
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Examples of vat color
vat color
A vat full of this dye is a darker color, approximating the web color midnight blue.
From the en.wikipedia.org
The color of denim is due to indigo, the original vat dye.
From the en.wikipedia.org
