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Old June 30th, 2009, 06:26 PM
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Default Re: "Natural" way to polish copper

Originally Posted by mattathayde View Post
salt has a mohs hardness of about 2.5 and copper (penny) is 3.5 (granted the fact that the copper is so thin might make it weaker). so there is no way that salt can scratch copper

The thinness of a material doesn't affect its hardness. Hardness is determined by the bond strength of the atoms its composed of.
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