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1985 Denver Minted Lincoln Cent RPM? How to clean?  
 

 
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United States
80 Posts
 Posted 07/11/2018  2:10 pm Show Profile   Bookmark this topic Add Bezo816 to your friends list Get a Link to this Message
While CRH I found this 1985 D Lincoln cent with what appears to be an RPM. The problem is that there is corrosion...Is it a RPM? Also, would anyone know of a way to clean this coin to get a better idea of what is going on? As always, thank you for your help.

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United States
22961 Posts
 Posted 07/11/2018  2:12 pm  Show Profile   Bookmark this reply Add John1 to your friends list Get a Link to this Reply
Not an RPM. It is zinc rot. Spend it don't clean it.
John1
( I'm no pro, it's just my humble opinion )
Searched 5+ Million Cents Since 1971
Valued Member
United States
80 Posts
 Posted 07/11/2018  2:18 pm  Show Profile   Bookmark this reply Add Bezo816 to your friends list Get a Link to this Reply
It's not rot, I don't think, there is metal there. I was trying to clean it a bit with a toothpick, and there is a metal ridge. Does rot make a ridge? Heck I don't know...thanks though.
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United States
1125 Posts
 Posted 07/11/2018  2:58 pm  Show Profile   Check Tanman2001's eBay Listings Bookmark this reply Add Tanman2001 to your friends list Get a Link to this Reply
Zinc rot can push the copper plating up and form a ridge like that. Just zinc rot, not a RPM.
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 Posted 07/11/2018  3:47 pm  Show Profile   Check Errors and Varietys's eBay Listings Bookmark this reply Add Errors and Varietys to your friends list Get a Link to this Reply
Errors and Varietys.
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 Posted 07/11/2018  3:50 pm  Show Profile   Bookmark this reply Add coop to your friends list Get a Link to this Reply
During the strike the copper plating gets split, then the zinc underneath get oxygen and it all down hill from there:

We see this every day here.
Richard S. Cooper
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 Posted 07/11/2018  3:56 pm  Show Profile   Check Errors and Varietys's eBay Listings Bookmark this reply Add Errors and Varietys to your friends list Get a Link to this Reply
This happens quite a bit. It's very common.
Errors and Varietys.
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United States
4196 Posts
 Posted 07/11/2018  4:09 pm  Show Profile   Bookmark this reply Add SilverDollar2017 to your friends list Get a Link to this Reply
It’s zinc rot. Spend it before it turns into a discombobulated piece of metal.
Collector of all classic US coinage.

How to identify cleaned coins: http://goccf.com/t/319679
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 Posted 07/11/2018  4:43 pm  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
Yep.
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United States
80 Posts
 Posted 07/11/2018  8:20 pm  Show Profile   Bookmark this reply Add Bezo816 to your friends list Get a Link to this Reply
My apologies...I didn't realize it could push metal up...THAT'S CRAZY!!. I might keep it as a science experiment, and see how bad it can get. Thanks again!
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