Hemosiderin

an iron storage protein

Description
Hemosiderin is a golden yellow or yellow-brown protein produced by phagocytic digestion of hematin. It is found in most tissues, especially in the liver, in the form of granules much larger than ferritin molecules (of which they are believed to be aggregates, but with a much higher content of iron (as much as 37% of iron), spleen, bone marrow, skin, and others. Hemosiderin stains blue with Perl's Prussian Blue Stain