Multiple choice

Which one of the following is a direct dye?

  1. Martius yellow

  2. Aniline yellow

  3. Malachite green

  4. All of these
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A Correct answer
Explanation

Direct dyes are applied to fiber from an aqueous solution in the presence of electrolytes without the need for a mordant. Martius yellow (also called Acid Yellow 32) is a direct dye that binds directly to cellulose fibers through van der Waals forces and hydrogen bonding. Aniline yellow is an azo dye, Malachite green is a basic (cationic) dye, and 'All of these' is incorrect because they belong to different dye classes.

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