Which reagent acts as the counterstain in Hematoxylin and Eosin staining?

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Multiple Choice

Which reagent acts as the counterstain in Hematoxylin and Eosin staining?

In H&E staining, the counterstain is the dye that provides contrast to what the primary stain colors. Eosin serves this role by staining the cytoplasm and connective tissue pink, while hematoxylin colors the nuclei blue-purple. Hematoxylin is the primary stain, not the counterstain. Acid alcohol is used to differentiate and differentiate the stain intensity, helping to remove excess stain, and lithium carbonate is used to adjust the hematoxylin reaction (often to blue it) rather than to provide the counterstain.

In H&E staining, the counterstain is the dye that provides contrast to what the primary stain colors. Eosin serves this role by staining the cytoplasm and connective tissue pink, while hematoxylin colors the nuclei blue-purple. Hematoxylin is the primary stain, not the counterstain. Acid alcohol is used to differentiate and differentiate the stain intensity, helping to remove excess stain, and lithium carbonate is used to adjust the hematoxylin reaction (often to blue it) rather than to provide the counterstain.

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