The compound obtained by the reaction of oxygen on iron. Either iron(II) oxide (old term ferrous oxide, chemical formula FeO) or iron(III) oxide (old term ferric oxide, chemical formula Fe2O3). Generally known as rust when hydrated
Fe2O3 is one of the potters favorite colorants, when combined with the right glaze and firing iron oxide can produce greens, browns, blacks, yellows, oranges, subtle blues and grays Most of the best color responses for Iron in a glaze need a reduction firing Iron is also a useful colorant in clay bodies and is best introduced by adding high iron clays to the clay recipe
A compound consisting of iron (Fe) combined with oxygen (O) It is the rust you see on iron or steel left exposed to oxygen in the air Hematite (Fe2O3) and Magnetite (Fe3O4) are minerals of iron oxide