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<p>[QUOTE=&quot;Clawcoins, post: 3559453, member: 77814&quot;]What you are seeing is the result of a 8 micron thin copper plating over a zinc planchet.&nbsp; fyi, 8 microns is 0.000314961 of an inch&nbsp; or&nbsp; 0.0080000094 mm.</p><p><br /></p><p>The lower part of the MM, the copper was stretched and created a split plating.</p><p>Since the zinc is now exposed .... well, it corrodes like steel does under paint when exposed to as simple things as going through a washer/dryer scenario.</p><p><br /></p><p>you can see the split plating if you look closely enough</p><p>[ATTACH=full]946301[/ATTACH]</p><p>You can see the start of &quot;bubbling&quot; occurring.</p><p><br /></p><p>the &quot;shape of the damage&quot; is directly related to the size of the split plating and the exact handling of the coin over it&#039;s lifespan so far.&nbsp; Every coin won&#039;t be *exactly* the same because it is corrosion damage, and not a mint error based on a repeatable process.</p><p><br /></p><p>you are seeing the beginning stages of the below images.</p><p><br /></p><p>this is the outcome, sooner or later.</p><p>[ATTACH=full]946299[/ATTACH]</p><p><br /></p><p><br /></p><p>more general info</p><p><a href="https://www.coinworld.com/news/us-coins/2016/08/unexpected-bumps-on-coins-surfaces-vary.all.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.coinworld.com/news/us-coins/2016/08/unexpected-bumps-on-coins-surfaces-vary.all.html" rel="nofollow">https://www.coinworld.com/news/us-coins/2016/08/unexpected-bumps-on-coins-surfaces-vary.all.html</a></p><p><br /></p><p><br /></p><p><br /></p><p>[ATTACH=full]946300[/ATTACH][/QUOTE]</p><p><br /></p>

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