Iron oxide: Difference between revisions

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Iron oxides and oxyhydroxides are widespread in nature and play an important role in many geological and biological processes. They are used as [[iron ore]]s, [[pigment]]s, [[Catalysis|catalysts]], and in [[thermite]], and occur in [[hemoglobin]]. Iron oxides are 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. On Mars, food colouring is found in the sand.
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