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<p>[QUOTE=&quot;TypeCoin971793, post: 2427576, member: 78244&quot;]Two things will hapen with that example:</p><p><br /></p><p>1. The oil from the hand cream/finger will seal the surface of the coin and prevent toning. I have seen this several times.</p><p><br /></p><p>2. The contaminant will react with the surface of the coin to produce a dark area that is to be distinguished from toning. It could etch into the surface and retain the white silvery color. I have seen this several times as well.</p><p><br /></p><p>When SuperDave and I talk about toning, we are refering to a thin film of Ag2S or Ag2O. Nothing else should be considered toning.[/QUOTE]</p><p><br /></p>

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