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<p>[QUOTE=&quot;GDJMSP, post: 3455512, member: 112&quot;]It doesn&#039;t need to touch anything, contact with other materials is not what causes the toning. It&#039;s the gasses put off by the other materials that cause the toning ! And since cardboard contains high amounts of sulfur - that&#039;s the explanation for the toning.</p><p><br /></p><p>As for the rapidity of the toning, that&#039;s rather easily explained as well. Given the lack of any toning at all to begin with, the coin was obviously dipped or cleaned with an acidic solution of one kind or another. That results in fresh silver being exposed. And then the coin is trapped inside a small closed box which is full of sulfurous gasses. So it&#039;s only natural for it to tone like that, and that fast.[/QUOTE]</p><p><br /></p>

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