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 Replies: 13 / Views: 951 |
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Pillar of the Community
United States
3166 Posts |
I have been researching plating issues on Copper Plated Zinc Cents. The information I have found has been both interesting and challenging. My research has resulted in some papers I prepared to organize the information in a way that I can understand. Unfortunately, I have only scratched the surface! It seems that I continue to find significant related aspects that I may yet include in future revisions. I am sharing one of those papers here in .pdf format . Click on the link to read. https://www.coincommunity.com/pdf/W...%20Split.pdf |
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Pillar of the Community
 United States
4375 Posts |
In 1983? 1984? the mint had Jarden change the core to include a tiny bit of copper so the plating adheres better (97.5% Zinc 2.5% Copper IIRC). Did you find a measurable difference between the two?
-----Burton 50 year / Life / Emeritus ANA member (joined 12/1/1973) Life member: Numismatics International, CONECA Member: TNA, FtWCC, NETCC, OnLine Coin Club Owned by four cats and a wife of 40 years (joined 1983) |
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Pillar of the Community
 United States
3166 Posts |
Quote:
In 1983? 1984? the mint had Jarden change the core to include a tiny bit of copper so the plating adheres better (97.5% Zinc 2.5% Copper IIRC). Did you find a measurable difference between the two? I recall a general reference to the addition of copper to the zinc alloy but do not recall a date being mentioned. (Will double check) I have found no measurable differences.
Edited by Pete2226
04/19/2025 5:38 pm
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Pillar of the Community
Canada
665 Posts |
Thanks Pete, that was a very interesting read. Now I can understand the anomalies on some of my coins.
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Pillar of the Community
United States
3166 Posts |
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. Thanks Pete, that was a very interesting read. Now I can understand the anomalies on some of my coins. You are welcome! This research has been interesting and challenging!
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Moderator
 United States
69743 Posts |
a very interesting File - good read.
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Pillar of the Community
United States
3166 Posts |
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. a very interesting File - good read. Thank you ! I think that I have only "scratched" the surface! 
Edited by Pete2226
04/20/2025 04:19 am
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Pillar of the Community
United States
5475 Posts |
Very interesting, especially for those of us that like the Lincoln Cent series. Lots of food for thought. Thank you for your time and the extra effort you take to explain the technical aspects (yeah, there are a "few") of your research on a layman's level. It helps me get a grasp on parts of it. (Here's a related realization; I wish my mental elasticity would "bounce" back better when I need to recall information.) Words of encouragement are one of the major food groups.
We need to consume them regularly to thrive and grow.
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Pillar of the Community
United States
3166 Posts |
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(Here's a related realization; I wish my mental elasticity would "bounce" back better when I need to recall information.) UNDERSTOOD! I am 84 and find this kind of research helps somewhat in fighting off dementia, but I notice my mental acuity diminishing along with the rest of me anyway! (I also understood your veiled reference to plastic/elastic!!  ) Some of the research papers I read were so complex and technical that the challenge was overwhelming in places. You should see my digital library for this and the papers I posted earlier! Those papers are located here: ARE PROOF CENTS "DOUBLE PLATED"? https://goccf.com/t/478482 PLATING SURFACE CORRUGATION https://goccf.com/t/478381 Thanks for your comments and support!
Edited by Pete2226
04/20/2025 09:33 am
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Pillar of the Community
United States
554 Posts |
Thanks Pete! So far I've only given this a quick, partial read, but I've already learned the answers to a few questions I've had about plating. I'm looking forward to giving this the attention it deserves.
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Pillar of the Community
United States
3166 Posts |
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Thanks Pete! So far I've only given this a quick, partial read, but I've already learned the answers to a few questions I've had about plating. I'm looking forward to giving this the attention it deserves. You are welcome! I have appreciated the exchange of questions/ideas on the forum! They have repeatedly pushed and encouraged me to dig deeper!
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Moderator
United States
162274 Posts |
Very interesting!  |
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Pillar of the Community
United States
3166 Posts |
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Very interesting! Thank you! It has been a fascinating study!
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Pillar of the Community
United States
6038 Posts |
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Replies: 13 / Views: 951 |
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Posted 04/19/2025 5:36 pm
