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<p>[QUOTE=&quot;Oldhoopster, post: 4640257, member: 84179&quot;]It&#039;s actually corrosion, also referred to as &quot;zinc rot&quot;.&nbsp; If the thin copper plating is breached, the zinc underneath can start to corrode, much like rust on a scratched car fender.&nbsp; This is also common around the mintmarks of 80s zinc cents.&nbsp; Sometimes the blisters can look like the coin a repunched mm[/QUOTE]</p><p><br /></p>

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