Iron in tissues is stained with which of the following stains?: (A) Sudan O, (B) Prussian Blue, (C) PAS, (D) None of the above
Answer is B. Iron pigment appears as a coarse, golden, granular pigment lying within the cell's cytoplasm. It can be visualized in tissues by the Prussian blue histochemical reaction, in which colorless potassium ferrocyanide is conveed by iron to blue-black ferric ferrocyanide. Ref: Robbins, 8th edition, Chapter 1.