Black powder, addition compound of ferrous oxide and ferric oxide, with magnetism, high tinctorial strength and covering power, good resistance to light and atmosphere, good light-fastness, and no impermeability or oil residue. It is very stable in general organic solvents, not resistant to acid, soluble in hot strong acid. Good alkali resistance Applications of iron oxide black: Industrial coatings, antirust paint and priming paint; Making water-color and grease-paint in industry of culture and eduction; Forartificial marble and tinting to floor in building construction; Manufacture of magnetic steel in electronic and telecommunication industry; Defectoscopy in machinery-manufactruing industry