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<p>[QUOTE=&quot;Michael K, post: 3300278, member: 78298&quot;]Lemon juice&nbsp; (and salt) will clean copper jewelry.</p><p>But it will only damage a copper coin. And has damaged the nickel,</p><p>as now it has been etched by acid.</p><p>There is a debate that acetone is not safe for copper. Some say it is OK</p><p>and others say not to use it on copper.</p><p>The fact that you turned the nickel pink, means it is 100% damaged. But,</p><p>it was only worth a nickel before, and it&#039;s still worth a nickel.</p><p>Never use lemon juice on coins.[/QUOTE]</p><p><br /></p>

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