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<p>[QUOTE="coinhead63, post: 1369361, member: 28001"]What has happened is post mint damage. It has been in a wishing well or other wet location for months. Any nick in the copper plating allows the zinc core to corrode into zinc oxide.</p><p>Just like painted steel, the oxidized metal expands distorting and blistering the surface layer. Try this: take 1983 or newer junk penny and nick the copper layer in one spot. Put it in</p><p>a jar with a 1/4 cup of vinegar. After several weeks pull the penny out. It should be mostly if not completely hollow. </p><p><br /></p><p>Your penny was on it's way towards being hollow.[/QUOTE]</p><p><br /></p>
[QUOTE="coinhead63, post: 1369361, member: 28001"]What has happened is post mint damage. It has been in a wishing well or other wet location for months. Any nick in the copper plating allows the zinc core to corrode into zinc oxide. Just like painted steel, the oxidized metal expands distorting and blistering the surface layer. Try this: take 1983 or newer junk penny and nick the copper layer in one spot. Put it in a jar with a 1/4 cup of vinegar. After several weeks pull the penny out. It should be mostly if not completely hollow. Your penny was on it's way towards being hollow.[/QUOTE]
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