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<p>[QUOTE=&quot;BadThad, post: 766658, member: 17261&quot;]Toning is mostly caused by hydrogen sulfide (H2S). Exposure to H2S gas will rapidly tone a coin. Simply place the coin into a sealed container with a piece of fruit (not in contact). As the fruit degrades it will release H2S and tone the coin. Keep a close eye on the process or your silver coin will turn out black![/QUOTE]</p><p><br /></p>

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