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<p>[QUOTE=&quot;galapac, post: 2155408, member: 73406&quot;]I used to use a micro fiber cloth to clean my glasses which has this same facial residue that you mention. By accident I wrapped up a 2015 Silver Maple in the cloth to protect it until I could store it and wouldn&#039;t you know....after a few days blue toning started showing up on the coin. Really strange but may be due to sulfur compounds as suggested above. Would this be considered &quot;natural&quot; toning since nothing was done other than wrapping the coin in the cloth?[/QUOTE]</p><p><br /></p>

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