<unk> 3O4 is used as a black pigment and is known as C.I pigment black 11 (C.I. No.77499) or Mars Black.<unk> 3O4 is used as a catalyst in the Haber process and in the water-gas shift reaction. The latter uses an HTS (high temperature shift catalyst) of<unk>  oxide stabilised by chromium oxide. This<unk> –chrome catalyst is reduced at reactor start up to generate<unk> 3O4 from α-Fe2O3 and Cr2O3 to CrO3. Bluing is a passivation process that produces a layer of<unk> 3O4 on the surface of steel to protect it from rust.<unk> rumoxytol along with sulfur and aluminium, it is an ingredient in a specific type of thermite useful for cutting steel. Medical uses Nano particles of<unk> 3O4 are used as contrast agents in MRI scanning.<unk> rumoxytol, sold under the brand names<unk> raheme and Rienso, is an intravenous<unk> 3O4 preparation for treatment of anemia resulting from chronic kidney disease.<unk> rumoxytol is manufactured and globally distributed by AMAG Pharmaceuticals.
Iron
Zinc
Copper 
Biotin
Folate
Selenous acid
Calamine
Sybil 