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<p>[QUOTE=&quot;lordmarcovan, post: 4591972, member: 10461&quot;]I&#039;d be tempted to try <a href="http://www.metaldetectingintheusa.com/electrolysis.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.metaldetectingintheusa.com/electrolysis.html" rel="nofollow">electrolysis</a> on it.</p><p><br /></p><p>It might be too far gone, but on the other hand, since it&#039;s already rather ugly, some careful tinkering with it may be possible.</p><p><br /></p><p>If you don&#039;t have (or feel like putting together) an electrolysis rig, there is another trick I have used on metal detector finds, with mixed results. </p><p><br /></p><p>Simply take a small bowl and pour a little bit of household first aid strength <b>hydrogen peroxide</b> solution into the bottom of the bowl.</p><p><br /></p><p>Heat it in the microwave to just short of boiling.&nbsp; Remove the bowl (taking care not to scald yourself) and drop the crusty coin into the hot peroxide, then watch as it fizzes away the surface deposits. </p><p><br /></p><p>Remove the coin carefully and repeat the process for the other side, since only the the side that was face up in the bowl will have gotten &quot;fizzed&quot;.&nbsp; Work at any stubborn deposits with a toothpick or bamboo skewer.</p><p><br /></p><p>It&#039;s kind of a drastic step, but I think a big silver coin can take it.</p><p><br /></p><p><b>Caveat:</b> I&#039;ve never tried it on a big silver coin with deposits like that.&nbsp; I have, however, used it on dug Wheat cents and a silver dime or two that I found.&nbsp; Your&#039;re left with somewhat dull looking silver, just as you would be if you had dipped the coin in commercial coin dip solution, but the hot peroxide method performs similarly to electrolysis in fizzing away the crud.&nbsp; (Maybe not <i>quite</i> as effectively.)</p><p><br /></p><p>So in the end you&#039;ll have a cleaned coin, and it will always be a &quot;problem&quot; coin regardless- it&#039;s too far gone not to be, now.&nbsp; But you might be able to improve its appearance somewhat.[/QUOTE]</p><p><br /></p>

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