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<p>[QUOTE=&quot;gsimonel, post: 2737328, member: 82549&quot;]It looks like the surface of your coin has reacted with its environment in such a way that its chemistry has changed. This is not just a simple case of dirt or something stuck on the surface. Your surface has changed.</p><p><br /></p><p>There is a product called Verdi-Care that you might consider. It has been discussed in this forum a couple of times before:</p><p><br /></p><p><a href="https://www.cointalk.com/threads/verdi-care.222408/" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/verdi-care.222408/">https://www.cointalk.com/threads/verdi-care.222408/</a></p><p><a href="https://www.cointalk.com/threads/verdi-care.257286/" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/verdi-care.257286/">https://www.cointalk.com/threads/verdi-care.257286/</a></p><p><br /></p><p>Here&#039;s a source for it if you&#039;re interested:</p><p><a href="http://www.wizardcoinsupply.com/products/verdi-care.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.wizardcoinsupply.com/products/verdi-care.html" rel="nofollow">http://www.wizardcoinsupply.com/products/verdi-care.html</a></p><p><br /></p><p>I&#039;ve never used this product, and so I have no opinion about it.</p><p><br /></p><p>Electrolysis is another possibility. It will remove the green build-up, but with two (actually one and a half) downsides:</p><p><br /></p><p>1) The surface of the coin under the green build-up has been eaten into slightly, a result of the copper oxidizing. Removing the green stuff will reveal a rough, pitted surface. </p><p><br /></p><p>2) You will wind up with a bright, shiny coin that looks unnatural for a coin so old. The reason this is really drawback 1.5 rather than 2, however, is that over time the coin will gradually re-tone and darken. It will take a few years, but eventually it will look nice again (except for the rough surface).</p><p><br /></p><p>A third possibility is to take a scalpel and scrape away the build-up, preferably under a stereo microscope. This is often called &quot;smoothing.&quot; Some collectors object to it, others don&#039;t.</p><p><br /></p><p>A fourth possibility is to enjoy your coin the way it is right now.[/QUOTE]</p><p><br /></p>

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