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<p>[QUOTE=&quot;Oldhoopster, post: 3975448, member: 84179&quot;][USER=101265]@Chip Kirkpatrick[/USER] You can think of zinc rot (corrosion) as being similar to rust on your car.&nbsp; When you get a scratch on your fender, the iron in the exposed steel will begin to rust.&nbsp; Over time, rust will progress under the paint and cause it to bubble and blister.</p><p><br /></p><p>The copper plating is approx 8 microns thick (less than 1/1000 of an inch.&nbsp; It doesn&#039;t take much to breech that plating and once The zinc is exposed, even with a very tiny hole, corrosion can start of exposed to the right environment. </p><p><br /></p><p>Now look at the discoloration and environmental damage of your coin.&nbsp; You think that the plating could have been breached? </p><p><br /></p><p>The chemistry isnt exactly the same as iron rusting, but you get the idea.[/QUOTE]</p><p><br /></p>

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