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<p>[QUOTE=&quot;GDJMSP, post: 1270188, member: 112&quot;]People always seem to think that just because it was a long time ago that people back then didn&#039;t know how to work with metals or refine metals. Well, not much has changed really even with modern technology. Humans have been refining copper for thousands of years - longer than any other metal. They had no problems in that regard.</p><p><br /></p><p>But copper is also our most reactive coinage metal, it reacts with almost anything.&nbsp; Water of any kind corrodes it, minerals and acids in the ground corrode it, even exposure to the air will cause copper to corrode over a period of time. So the only unusual thing is when you find older copper coins that are not corroded.[/QUOTE]</p><p><br /></p>

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