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<p>[QUOTE=&quot;lordmarcovan, post: 24868828, member: 10461&quot;]No harm in a little &quot;science project&quot; on some lower-value silver, I reckon, as long as you&#039;re honest about the process if you decide to sell them later.</p><p><br /></p><p>I have found that coins left in sunlight on a windowsill can sometimes tone nicely.&nbsp; It takes a long time, though, and I suppose you&#039;d need to flip it over after one side tones.</p><p><br /></p><p>There is also the old &quot;<a href="https://forums.collectors.com/discussion/733236/taco-bell-napkins-and-re-toning" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://forums.collectors.com/discussion/733236/taco-bell-napkins-and-re-toning" rel="nofollow">Taco Bell Napkin Trick</a>&quot;.&nbsp; The brown paper napkins used by Taco Bell and some other fast food restaurants have sulfur content and can tone coins, over time.</p><p><br /></p><p>(*Sorry, all the pics in that old 2009 CU forum thread are all dead now.&nbsp; <a href="https://boards.ngccoin.com/topic/114123-taco-bell-napkin-coin-the-legend-new-pics-addded/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://boards.ngccoin.com/topic/114123-taco-bell-napkin-coin-the-legend-new-pics-addded/" rel="nofollow">Here&#039;s an even older thread</a> from the NGC forums, with some good pix.)[/QUOTE]</p><p><br /></p>

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