Colors: black/red/yellow/green/brown/blue Pigment chemical materials Good texture, clean powder Properties: Brilliantly colored powder Strong coloring power, excellent coverage Good weather ability Specifications: Cubic, metastable, converts to the alpha phase at high temperatures Occurs naturally as the mineral maghemite Ferromagnetic Ultrafine particles smaller than 10 nanometers are super paramagnetic Can be prepared by thermal dehydratation of gamma iron (III) oxide-hydroxide, careful oxidation of iron (II, III) oxide Ultrafine particles can be prepared by thermal decomposition of iron(III) oxalate Applications: Iron industry: overwhelming application of iron (III) oxide is as the feedstock of the steel and iron industries, such as production of iron, steel and various alloys Polishing: Fine powder of ferric oxide is known as jeweler's rouge, red rouge or simply rouge, used to put the final polish on metallic jewelry and lenses, and historically as a cosmetic Rouge cuts more slowly than some modern polishes, such as cerium(IV) oxide, but is still used in optics fabrication and by jewelers for the superior finish it can produce, when polishing gold, the rouge slightly stains the gold, which contributes to the appearance of the finished piece Rouge is sold as a powder, paste, laced on polishing cloths, or solid bar (with a wax or grease binder) Other polishing compounds are also often called rouge, even when they do not contain iron oxide Jewelers remove the residual rouge on jewelry by use of ultrasonic cleaning Tool sharpening: products sold as stropping compound are often applied to a leather strop to assist in getting a razor edge on knives, straight razors, or any other edged tool Pigment: Niche use