What stain is used for detecting ferric salts and hemosiderin?

Perl's Prussian blue stain is specifically designed to identify ferric salts and hemosiderin, which are forms of stored iron in tissues. This stain reacts with iron to produce a blue pigment, making it particularly useful in the context of diagnosing conditions such as hemochromatosis and hemosiderosis. The mechanism involves the formation of a dark blue complex when the ferric ions are treated with potassium ferricyanide, highlighting areas of iron accumulation effectively.

The other options listed serve different purposes. For instance, the peroxidase reaction is primarily used to identify enzyme activity, while Grocott's methenamine silver stain is utilized mainly for fungal organisms and certain types of connective tissue. The Orcein method is often employed for staining elastic fibers. Thus, while those methods have their specific applications, they do not provide the targeted detection of iron that Perl's Prussian blue does.