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<p>[QUOTE=&quot;-jeffB, post: 26138085, member: 27832&quot;]Oh, yes. In general, heat accelerates <i>any</i> chemical reaction. With wood and paper, and some plastics, it frees up the things that do tone coins - mostly vapors containing acid and/or sulfur compounds.</p><p><br /></p><p>And, as [USER=73995]@Pickin and Grinin[/USER] said, moisture. It&#039;s <i>possible</i> for coins to tone or corrode without it, but it&#039;s much harder when the air is dry, and much easier when the air is humid. And if the air is humid, then everything cools off, and moisture <i>condenses</i> on the coin - well, then you&#039;re in a world of hurt.[/QUOTE]</p><p><br /></p>

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