... . Better dispersion. Strong covering power and tinctorial strength, a specific gravity of about 5.1, and average particle size < 1 micron ... , only soluble in the hot strong acid.Addition compound of ferrous oxide and ferric oxide, with magnetism, high strength ... hot strong acid. Good alkali resistanceApplication:1)Used for coloring of construction, paints, plastic rubber, printing ink, porcelan, color ...