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<p>[QUOTE=&quot;Hookman, post: 3999897, member: 99642&quot;]It&#039;s either been melted by heat or by acid.</p><p><br /></p><p>I remember when I was first shown the difference between the old copper cents and the new zinc ones.</p><p>A friend, who was an amateur jeweler, used her torch to heat a copper penny. It heated up, glowed red and nothing else.</p><p>Then she did the same to a zinc penny. It began to heat up, then suddenly it melted into a round, white glob of zinc. The copper it was plated with just seemed to disappear.</p><p><br /></p><p>I was surprised and amazed.[/QUOTE]</p><p><br /></p>

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