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<p>[QUOTE=&quot;Michael K, post: 3524406, member: 78298&quot;]It has been 20 years. I don&#039;t know where the nickel was stored.</p><p>Exposure to different gases can cause this. Intentional exposure to</p><p>heat sources could do something. I don&#039;t believe it carries any extra</p><p>value, but if you like the way it looks you can always save it in an</p><p>inexpensive 2x2 coin flip.&nbsp; There are probably dozens of reasons why or</p><p>how a coin will tone.&nbsp; Albums, (the cardboard out gases), environmental</p><p>factors. Natural and unnatural toning. It&#039;s hard to pin it down to one thing.[/QUOTE]</p><p><br /></p>

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