Cerebrospinal fluid specimen stained with<unk>  showing iron containing macrophage (stained blue) surrounded by erythrocytes (stained red).<unk>  is a commonly used method in histology, histopathology, and clinical pathology to detect the presence of iron in tissue or cell samples.<unk>  derives its name from the German pathologist Max<unk>  (1843–1881), who described the technique in 1867. The method does not involve the application of a dye, but rather causes the pigment<unk>  blue to form directly within the tissue. The method stains mostly iron in the ferric state which includes ferritin and hemosiderin, rather than iron in the ferrous state.
Perls Prussian blue
Erythema gyratum repens
Hemosiderin
Coomassie brilliant blue
Alcian blue stain
Aqueous humour
Luxol fast blue stain
Gripe water