A 1120 (OTTOKEMI) Acid Fuchsin calcium salt, 60 % CAS-123334-10-1, is used as a biological stain in preparations including the histopathological polychrome of Pianese, the Ehrlich-Biondi triacid procedure for blood smears, and the Altmann stain for mitochondria. Various polychrome stains like the Masson polychrome variant; Van Gieson, and Mallory connective tissue stains contain Acid fuchsine.