A) azo dyes
B) dispersed dyes
C) basic dyes
D) vat dyes
Correct Answer: D
Solution :
There are some insoluble dyes. To apply, these are first reduced into coloured soluble form in large wooden vats with alkaline reducing agents. The fabric is now dipped in this reduced dye and then exposed to air. Here, the dye gets oxidised. Since, such dyes are reduced in wooden vats, these are called vat dyes.
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