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HT Histotechnician

Category - Staining

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Which of the following choices is a metachromatic dye?

Iodine
Malachite green
Methyl green
Methylene violet

Explanation

Answer: D - Methylene violet
Of the following choices the metachromatic dye is methylene violet. It is formed when methylene blue is heated in fixed alkali. It will stain the nuclei of leukocytes reddish-purple. All the other choices are not metachromatic dyes.

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