Schmorl ferric-ferricyanide reduction stain
Pronunciation: shmōrl
Definition: a stain to test for reducing substances in tissues, including melanin, argentaffin granules, thyroid colloid, keratin, keratohyalin, and lipofuscin pigments; ferricyanide is converted into ferrocyanide that is converted to insoluble Prussian blue in the presence of ferric ions.
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Examples: glitazone, GI cocktail, etc.

