What color is hemosiderin detected as in a reaction?

Hemosiderin is a pigment that results from the breakdown of hemoglobin and is often associated with conditions of iron overload in the body. In histopathologic techniques, hemosiderin can be identified using specific stains, such as Prussian blue, which highlights iron deposits within tissues. When stained using this technique, hemosiderin appears blue due to the formation of a colored complex when the iron reacts with the components of the stain.

This blue coloration is significant because it allows pathologists to visually assess the presence and concentration of iron in tissues, providing important diagnostic information. In contrast, other colors mentioned, such as red, green, or yellow, do not accurately reflect the stain reaction of hemosiderin and thus may not be relevant to its identification. Therefore, the blue coloration is key in confirming the presence of hemosiderin during histological examinations.