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जब लोहे को नम हवा में रखा जाता है, तो हाइड्रेटेड आयरन (III) ऑक्साइड (Fe2O3) की एक लाल भूरे रंग की परत इसकी सतह पर जमा हो जाती है। इस लाल भूरे रंग की परत को कहते हैं:

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जब लोहे को नम हवा में रखा जाता है, तो हाइड्रेटेड आयरन (III) ऑक्साइड (Fe2O3) की एक लाल भूरे रंग की परत इसकी सतह पर जमा हो जाती है। इस लाल भूरे रंग की परत को कहते हैं:






 
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