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<p>[QUOTE=&quot;-jeffB, post: 3237342, member: 27832&quot;]Rinse any contaminants from a coin&#039;s surface, then seal it in an atmosphere of nitrogen or argon, and <b>you stop toning</b>. There&#039;s nothing for the coin&#039;s surface to react with.</p><p><br /></p><p>I suspect that it&#039;s enough to simply remove the contaminants and then seal it in <i>dry</i> air, in a container that doesn&#039;t produce reactive substances.</p><p><br /></p><p>The problem is that not only do most collectors not have a source of pure nitrogen or argon, they don&#039;t even have a source of clean and dry (enough) air, nor a proper container. Except the Mason jars Doug mentioned, and I hope the gasket on the lid isn&#039;t (sulfur-bearing) rubber.[/QUOTE]</p><p><br /></p>

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