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<p>[QUOTE=&quot;westnlas, post: 1515903, member: 28223&quot;]1968 D are copper cents weighing about 3.1 grams. Cents were changed in composition in 1982 to copper coated zinc. Those weigh about 2.5 grams. </p><p><br /></p><p>There are a number of double die varieties of the 1968 Ds and a good reference for those is <a href="http://www.coppercoin.com" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.coppercoin.com" rel="nofollow">www.coppercoin.com</a>.</p><p><br /></p><p>Discoloration of copper can be caused by heat, chemicals, environmental, etc.</p><p>During the 60s a lot of high schools had shop classes and cents were used in experiments. You find a few that were acid soaked to reduce their size to that of a dime for parking meters and vending machines. Although most acid dipped cents seem to be earlier dated.</p><p><br /></p><p>Good eye ! Good luck searching. You won&#039;t find anything if you aren&#039;t looking ![/QUOTE]</p><p><br /></p>

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