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you must have seen if you leave a bolt out in the rain , areddish brown layer is deposited on it's surface after few days. it is called rust.iron reacts with oxygen of the air ,in the presence of moisture,to form a substance called iron oxide which we called rust.

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What objects are oxidising?

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I think what you are reffering to is iron oxide which is commonly known as rust


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Why is your black cast iron stove turning grey?

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