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HT Histotechnician

Category - Staining

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All of the following are metachromatic dyes, except:

Safranin
Toluidine blue
Bismarck brown
Eosin Y

Explanation

Answer: D - Eosin Y
All of the following are metachromatic dyes except for Eosin Y. Metachromatic dyes are basic dyes belonging to the thiazine and triphenylmethane group. Examples of such dye are safranin, toluidine blue and bismarck brown. Eosin Y is a cytoplasmic stain commonly used for counterstaining.

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