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<p>[QUOTE=&quot;Burton Strauss III, post: 24800907, member: 59677&quot;][USER=150594]@Barney McRae[/USER] it looks like the coin was exposed to something in the environment, but also protected by, well, something.</p><p><br /></p><p>An extreme example of that would be putting a rubber band on a silver coin and tossing it on the window ledge for a couple of months. The sulfur in the cheap rubber band would react with the silver and tone/tarnish it almost black, while the rest of the surface would be a more normal color.[/QUOTE]</p><p><br /></p>

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