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<p>[QUOTE=&quot;Colonialjohn, post: 2499974, member: 57741&quot;]The root cause of this problem is improper storage coupled with a very reactive substrate (Coin). The two constituents in the air causing this problem is chlorine and sulfur. The area you are probably storing these BU Cents is probably not always at room temperature and/or lacks a humidifier. We also know that zinc reacts more greatly with the above two constituents (Cl &amp; S) than copper. I have developed a copper cleaner but its not cost effective for low end priced coppers of this type and it would not be cost effective.</p><p>However I do notice some of these cents are of a high copper content and not copper plated zinc. Perhaps only the top two coins or so in each roll is environmentally damaged. Contact me privately if you wish to investigate your options further ... if the entire roll is spotted no need to reply ... of course.</p><p><br /></p><p>John Lorenzo</p><p>Numismatist</p><p>United States[/QUOTE]</p><p><br /></p>

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