Which stain demonstrates ferric iron in tissue using a blue reaction product?

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Multiple Choice

Which stain demonstrates ferric iron in tissue using a blue reaction product?

Explanation:
The test is about staining ferric iron in tissue with a blue product. Perl’s Prussian Blue does this by reacting ferric iron (Fe3+) released from storage forms like hemosiderin with ferrocyanide to form an insoluble blue compound, ferric ferrocyanide, which deposits where iron is present. This blue staining is the hallmark that confirms iron deposits in the tissue. PAS, Ziehl-Neelsen, and Grocott stain other components—polysaccharides, acid-fast bacteria, and fungal elements (among others), respectively—not iron. Hence they don’t produce the characteristic blue iron-positive result seen with Perl’s Prussian Blue.

The test is about staining ferric iron in tissue with a blue product. Perl’s Prussian Blue does this by reacting ferric iron (Fe3+) released from storage forms like hemosiderin with ferrocyanide to form an insoluble blue compound, ferric ferrocyanide, which deposits where iron is present. This blue staining is the hallmark that confirms iron deposits in the tissue.

PAS, Ziehl-Neelsen, and Grocott stain other components—polysaccharides, acid-fast bacteria, and fungal elements (among others), respectively—not iron. Hence they don’t produce the characteristic blue iron-positive result seen with Perl’s Prussian Blue.

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