Multiple choice

Which of the following is not used as a histological stain in biology?

  1. Cresyl violet

  2. Nile blue

  3. Indophenol

  4. Safranin
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C Correct answer
Explanation

Indophenol is an artificial blue metachromatic dye, obtained by the action of phenol on certain nitrogenous derivatives of quinone. Indophenol resembles the colour indigo in appearance. It is often used to determine the presence of vitamin C, or ascorbic acid. it is not used as a histological stain in biology.

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