If fungi are to be demonstrated, a good counterstain for the PAS technique is which color?

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Multiple Choice

If fungi are to be demonstrated, a good counterstain for the PAS technique is which color?

Explanation:
In PAS staining, fungal elements take on a magenta color due to the Schiff reaction. To make those magenta structures stand out clearly, you want a counterstain that provides strong contrasting color without overlapping the magenta. A light green counterstain gives that sharp contrast, making fungal elements easy to see against a green background. Other common counterstains would either clash with or obscure the magenta color (for example, eosin would add pinkish hues, while blue or red counterstains could compete with or mask the magenta). Although hematoxylin would be a typical counterstain for PAS in many protocols, it isn’t listed here.

In PAS staining, fungal elements take on a magenta color due to the Schiff reaction. To make those magenta structures stand out clearly, you want a counterstain that provides strong contrasting color without overlapping the magenta. A light green counterstain gives that sharp contrast, making fungal elements easy to see against a green background.

Other common counterstains would either clash with or obscure the magenta color (for example, eosin would add pinkish hues, while blue or red counterstains could compete with or mask the magenta). Although hematoxylin would be a typical counterstain for PAS in many protocols, it isn’t listed here.

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