Question

indigo belongs to mordant dye, direct dye, in grain dye, Or vat dye?
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Answer 1

Answer: Vat dye

Explanation:

Vat dyes are a class of dyes that are classified as such because of the method by which they are applied. Vat dyeing is a process that refers to dyeing that takes place in a bucket or vat. Almost any dye, including fiber-reacting dyes, direct dyes, and acid dyes, can be used in a vat dye. cotton, wool, leather, and other fibers can be all dyed with vat dye.  

The original vat dye is indigo, once obtained from plants but now produced synthetically.