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<p>[QUOTE=&quot;Oldhoopster, post: 4571782, member: 84179&quot;]As the name suggests, plating blisters are occur during the plating process, not the striking process.</p><p><br /></p><p>Plating blisters are generally caused by improper cleaning of the zinc blank or contamination in the plating bath.&nbsp; Whatever is going to cause blisters is already in place by the time the coin is struck.</p><p><br /></p><p>I can&#039;t say for certain based on your pics, but it looks like corrosion pitting.&nbsp; Notice how all of them are located in the area that&#039;s also stained.&nbsp; IMO, it looks like whatever caused the staining may have breached the plating, resulting in &quot;zinc rot&quot;.&nbsp; It has nothing to do with a &quot;contaminated die&quot; (BTW. Material stuck to the die results in filled die errors.&nbsp; IMO, calling it a contaminated die just confuses the issue.&nbsp; Filled die would be the appropriate term)</p><p><br /></p><p><br /></p><p>Regardless, plating blisters do not add value[/QUOTE]</p><p><br /></p>

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