Perl's Prussian blue stain uses which solution to demonstrate ferric iron deposits in hemochromatosis?

Study for the CAMLPR Histology Practice Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Prussian blue staining detects ferric iron by forming a blue ferric ferrocyanide pigment when ferric iron released from storage forms in tissue reacts with ferrocyanide under acidic conditions. The standard reagent is a solution of 2% potassium ferrocyanide combined with 2% hydrochloric acid. The acid liberates ferric iron from hemosiderin and other storage forms, allowing it to react with ferrocyanide to produce the blue Prussian blue complex that marks ferric iron deposits. This makes it a reliable method for visualizing iron accumulation, such as in hemochromatosis. Using potassium ferricyanide wouldn’t generate the same ferric ferrocyanide blue pigment, and although sodium ferrocyanide could in theory participate, the classic protocol uses potassium ferrocyanide; a higher concentration like 3% is not the standard, which is why the 2%/2% mix is the correct choice.