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<p>[QUOTE=&quot;desertgem, post: 3361656, member: 15199&quot;]Chris, it is Environmental damage , copper is very reactive with chemicals either in nature such as the ground, or in laboratories where chemistry can change the color for normal copper color to silver color ( with zinc) or gold color ( heating it with a flame after reacting with zinc. ) Check the web for &quot;Gold cent chemistry experiment. Jim[/QUOTE]</p><p><br /></p>

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