Multiple choice

Which of the following dyes is used for classifying bacteria?

  1. Crystal violet

  2. Ethyl Green

  3. Fast Green

  4. Fuchsine

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A Correct answer
Explanation

Crystal violet is a triarylmethane dye. The dye is used as a histological stain and in Gram's method of classifying bacteria. Crystal violet has antibacterial, antifungal, and anthelmintic properties and was formerly important as a topical antiseptic.

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