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<p>[QUOTE=&quot;centsdimes, post: 26494639, member: 26657&quot;]Long ago, as a boy, I learned the hard way not to clean coins, when I put an Indian head cent (that was pretty much black) into some copper cleaner. The coin came out bright and shiny, but the surface of the coin was very grainy.</p><p><br /></p><p>But now, as an old man, I&#039;ve had a little success improving coins that have environmental damage by gently rubbing the affected surfaces with a cotton swab, being careful not to scratch the coin. I&#039;ve also used a toothpick to remove some &quot;sludge,&quot; though it&#039;s easy to scratch a coin with a toothpick.[/QUOTE]</p><p><br /></p>

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