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<p>[QUOTE=&quot;Midas, post: 100336, member: 2761&quot;]Just typical toning (oxidation) from copper plating exposed to the elements.&nbsp; All Lincoln cents will experience this toning unless they are kept high, dry, and handled with due care.</p><p><br /></p><p>Remember, the old cents (before 1982) were 95% copper, 5% tin and zinc and cents minted afterward are now 99.2% zinc with only .8% copper (20% lighter).&nbsp; </p><p><br /></p><p>However the plating of post 1982 cents are still pure copper. Copper itself is VERY reactive to a number of elements including oxygen (hence the oxidation) and sulfur which forms copper-sulfate.&nbsp; Copper sulfate is dark in color.[/QUOTE]</p><p><br /></p>

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