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<p>[QUOTE=&quot;GDJMSP, post: 2232714, member: 112&quot;]It&#039;s not the loss of an outer layer, it&#039;s merely the changing of that outer layer&#039;s color from red to brown. If metal underneath were to be exposed, it would be a bright red color, and shiny. But no, the metal underneath would not have any luster.</p><p><br /></p><p>Brown toning on copper coins is the norm. It is by far the most common color for copper coins to tone. Just like battleship grey is the most common color for silver coins to tone.</p><p><br /></p><p>edit - Can brown toning be induced or caused by contact with human hands as suggested ? Yes it can. But even if no human ever touched a copper coin, that coin would still tone and turn brown, in the vast majority of cases anyway. All that is required for any coin, copper or silver, to tone is exposure to the air.[/QUOTE]</p><p><br /></p>

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