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<p>[QUOTE=&quot;Sallent, post: 3600617, member: 76194&quot;]You probably could brighten it by using lemon juice in a careful manner, with quick 5 minute dips and then carefully examining the results. I&#039;d probably try acetone first...sometimes acetone will brighten a coin, and it&#039;s safer.</p><p><br /></p><p>The question is not whether you can brighten it....you can. The question is what that process will reveal. You could end up with some unpleasant results if the removal reveals some old harsh cleaning underneath, or even a few dark spots from old mineral deposits. Or you could get lucky and have a totally pristine surface. It&#039;s up to you.[/QUOTE]</p><p><br /></p>

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