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<p>[QUOTE="Clawcoins, post: 5124173, member: 77814"]planchets are bought from an external supplier</p><p>they are very thin copper, I think 7 micron thin, copper plated zinc cores.</p><p><br /></p><p>Zinc reacts when plated with copper to such things as .. ooh steam (like if it goes through the laundry); left on the ground .. you know... standard use stuff. The coins are designed to be easily and low cost manufacturer, period for visual identification as one cent by cashiers, et all. They are not designed for "collectors" especially the ones designed and manufactured for circulation.</p><p><br /></p><p>Any time there is a breach in the copper surface you will start getting corrosion. </p><p>minor PMD can cause a breach. Split plating from die deterioration can cause a breach. scratches or other surface damage can cause a breach.</p><p>This corrosion can spread internally and start bubbling, linear plating blisters and a whole bunch of issues.</p><p><br /></p><p>Just know that a copper plate zinc planchet has corrosion domes, plating blisters (which include long linear ones). So many problems ....</p><p><br /></p><p>I was going to PM you something but your PM is turned off.[/QUOTE]</p><p><br /></p>
[QUOTE="Clawcoins, post: 5124173, member: 77814"]planchets are bought from an external supplier they are very thin copper, I think 7 micron thin, copper plated zinc cores. Zinc reacts when plated with copper to such things as .. ooh steam (like if it goes through the laundry); left on the ground .. you know... standard use stuff. The coins are designed to be easily and low cost manufacturer, period for visual identification as one cent by cashiers, et all. They are not designed for "collectors" especially the ones designed and manufactured for circulation. Any time there is a breach in the copper surface you will start getting corrosion. minor PMD can cause a breach. Split plating from die deterioration can cause a breach. scratches or other surface damage can cause a breach. This corrosion can spread internally and start bubbling, linear plating blisters and a whole bunch of issues. Just know that a copper plate zinc planchet has corrosion domes, plating blisters (which include long linear ones). So many problems .... I was going to PM you something but your PM is turned off.[/QUOTE]
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2017 d rpm one cent error
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