The Perl's Prussian Blue control slide corresponds to which specific slide type?

• A. Known Hemosiderosis Slide
• B. Known Fungi Slide
• C. Known Lipidosis Slide
• D. Known Amyloidosis Slide

Answer: (A)

Perl's Prussian Blue detects ferric iron in tissues, turning iron deposits blue. In practice, a positive control for this stain is a slide with known iron accumulation, so you can verify the stain is working properly. A known hemosiderosis slide provides those iron-containing areas that should mark blue with Prussian blue, confirming the procedure and reagents are functioning as intended. The other options relate to different tissues or stains—fungal organisms, lipids, or amyloid—and would not reliably demonstrate the iron-staining reaction. So the correct control slide type is the known hemosiderosis slide.