English
Noun
iron oxide (Plural: iron oxides)
wikipedia
#(Chemistry) 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 Fe<sub>2</sub>O<sub>3</sub>). Generally known as rust when hydrated.
Synonyms
E172 when used as a food colouring
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