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<p>[QUOTE=&quot;Clawcoins, post: 3564255, member: 77814&quot;]from mid 1982 on, they made cents not from a Copper disc, but a Zinc core with an 8 micron thin copper plating.&nbsp; If you pull out a wooden ruler that would be 0.000314961 of an inch or 0.0080000094 of a millimeter .. I hope your ruler goes that small.</p><p><br /></p><p>This super thin layer easily gets damaged by a variety of means.</p><p>One simply way of damaging a smooth 8 micron surface is to stamp it to some design. Such as they do with cents.</p><p><br /></p><p>So the thin copper layer gets stretched and it breaks and exposes the underlying zinc core.</p><p><br /></p><p>Zinc quickly corrodes when exposed to simple things like steam (think wash/dryer type).&nbsp; and a multitude of other stuff hitting it&#039;s surface.</p><p><br /></p><p>The problem you see with the D was very common as they still hand stamped the die, so but stamping it too hard they made it too deep,&nbsp; And making it too deep made the copper stretch too much, thus splitting it.&nbsp; Thus causing an immediate longevity problem.</p><p><br /></p><p>I think pre 1982 cents will outlive all the post 1982 cents as they&#039;ll just corrode and eat themselves over a short period of time.&nbsp; Why ppl collect &quot;bad&quot; zincolns is beyond me.</p><p>Thus Chris&#039;s comment ....[/QUOTE]</p><p><br /></p>

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