Which one of the following dyes cannot be used for staining chromatin material?

Acetocarmine

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Crystal violet

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Haematoxylin

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Schiff's reagent (Feulgen stain)

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Solution

The correct option is B Crystal violet
Crystal violet dye is used as a histological stain and in Gram's method of classifying bacteria.
Rest all other dyes in option as acetocarmine, haematoxylin and Schiff's reagent are used to stain chromosome.
Thus, the correct answer is option B.

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