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<p>[QUOTE=&quot;Diplodocus, post: 2378715, member: 77787&quot;][ATTACH=full]487371[/ATTACH] </p><p>In hand this 1985 D cent (found in a roll at work earlier today) is clearly not copper. How does one tell the difference between a real minting error, like an all zinc penny, and post mint damage chemical treatment or zinc plating? NOTE: penny seems really dirty</p><p><br /></p><p>I tried weighing it on a scale accurate just down to 1/10 of a gram; though not the most accurate scale this one weighed the same as my other penny samples from what I could tell. I am aware of <i>zinc plating</i> but don&#039;t know how much weight that might add.</p><p><br /></p><p>I&#039;ll come back later with some pics in different lighting.[/QUOTE]</p><p><br /></p>

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