metals are said to be shining? why do metals generally appear to be dull? how can be their brightness be restored?
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Most Metal being reactive in nature,react with oxygen present in the air to form their respective metallic oxides which are not lusturous and are rather dull...the shine of the metal can generally be restored by rubbing the metal with sandpaper as it helps to remove the oxide layer
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The brightness can be restorent by polishing
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