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<p>[QUOTE=&quot;BadThad, post: 886951, member: 17261&quot;]Like Doug said, they are ruined. They will always have signs of cleaning.</p><p>&nbsp;</p><p>Silver tones due to exposure to hydrogen sulfide. I recommend reading the book &quot;Coin Chemistry&quot; by W.White. A simple method of producing hydrogen sulfide is with rotting fruit. Wash the coin well with water and acetone to remove residual traces of cleaner. Put the coin in a sealed container with a piece of fruit, an apple works well. Over time, the degrading fruit will release hydrogen sulfide and tone the coin.[/QUOTE]</p><p><br /></p>

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