Iron oxide: Difference between revisions

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[[File:Almindeligt rust - jernoxid.jpg|thumb|260px|Electrochemically oxidized iron (rust)]]
'''Iron oxides''' are [[chemical compound]]s composed of [[iron]] and [[oxygen]]. There are sixteen known iron [[oxide]]s and oxyhydroxides[[oxyhydroxide]]s, the best known of which is [[rust]], a form of [[iron(III) oxide]].<ref name="cor">{{cite book
| last = Cornell
| first = RM
Iron oxides and oxide-hydroxidesoxyhydroxides are widespread in nature, and play an important role in many geological and biological processes,. and They are widely used by humans, e.g., as [[iron ore]]s, [[pigment]]s, [[Catalysis|catalysts]], and in [[thermite]], (seeand theoccur diagram) andin [[hemoglobin]]. Common [[rust]] is a form of [[iron(III) oxide]]. Iron oxides are widelyinexpensive used as inexpensive,and durable pigments in paints, coatings and colored concretes. Colors commonly available are in the "earthy" end of the yellow/orange/red/brown/black range. When used as a food coloring, it has [[E number]] E172.