Which of the following is a vat dye?

Which of the following is a vat dye?

  1. A

    Indigo

  2. B

    Malachite green

  3. C

    Orange-

  4. D

    Azo dye

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    Solution:

    Vat dyes are insoluble substances that produce a soluble (lencoform) derivative after reduction. The product may be coloured or colourless and has a preference for particular materials, including as Indigo.

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