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<p>[QUOTE=&quot;Hobo, post: 407734, member: 11521&quot;]Are you sure? My understanding is that copper is copper and carbon is carbon. Pure copper would not contain any carbon, would it? (If pure copper contains carbon then I didn&#039;t learn college chemistry and geology as well as I thought.)</p><p>&nbsp;</p><p>US copper coins are made of copper and a few other metals to make an alloy but I am not aware of carbon being one of them. </p><p>&nbsp;</p><p>Can you shed some light on this for me? </p><p>&nbsp;</p><p>My understanding of why copper (and copper alloy) coins are so prone to carbon spots is because copper is highly reactive, much more reactive than other metals used in US coins.[/QUOTE]</p><p><br /></p>

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