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Strange metal bumps on a 1991-D Lincoln Cent.  
 

 
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United States
26 Posts
 Posted 06/29/2018  1:22 pm Show Profile   Bookmark this topic Add SawtoothJack to your friends list Get a Link to this Message
Found this strange 1991 US cent with these weird bumps all over it in a roll search (finally found that presentable 2017-P for my album by the way). Tried to get good closeups of the raised metal lumps. What you’re seeing in the photos is a 20x to 40x zoom of the field on the obverse. Looks kinda like ole’ Abe is sneezing. #129315; I’m leaning towards PMD, maybe from heat or chemicals, but it could be a mint error. As we all know, Quality control has certainly let bigger goofs slip by in the past.
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United States
15475 Posts
 Posted 06/29/2018  1:41 pm  Show Profile   Bookmark this reply Add moxking to your friends list Get a Link to this Reply
Zinc rot. Copper plating is detaching from interior zinc.
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United States
26 Posts
 Posted 06/29/2018  1:48 pm  Show Profile   Bookmark this reply Add SawtoothJack to your friends list Get a Link to this Reply
Makes sense. One spot on the reverse actually looks like a volcano.
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United States
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 Posted 06/29/2018  1:49 pm  Show Profile   Bookmark this reply Add SawtoothJack to your friends list Get a Link to this Reply
Thanks for your help. I’d never even heard of zinc rot before.
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7518 Posts
 Posted 06/29/2018  2:17 pm  Show Profile   Bookmark this reply Add Spence to your friends list Get a Link to this Reply

Quote:
I’d never even heard of zinc rot before.


If you hang out in this part of CCF for very long, you'll see that it comes up quite frequently. It is a great learning experience!
"It certainly strikes the beholder with astonishment, to perceive what vast difficulties can be overcome by the pigmy arms of little mortal man, aided by science and directed by superior skill." --Henry Tudor (the lawyer not the king)
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Canada
3875 Posts
 Posted 06/29/2018  2:25 pm  Show Profile   Bookmark this reply Add Dorado to your friends list Get a Link to this Reply
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1533 Posts
 Posted 06/29/2018  3:17 pm  Show Profile   Bookmark this reply Add nfine to your friends list Get a Link to this Reply
I have to ask, how can you tell anything from those images?
Remember, what the Dormouse said.
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15475 Posts
 Posted 06/29/2018  4:23 pm  Show Profile   Bookmark this reply Add moxking to your friends list Get a Link to this Reply
Bubbly surface + date = zinc rot. Photo is good enough to see that.
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26574 Posts
 Posted 06/29/2018  4:31 pm  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
At first I thought it was something from the Mars Rover, but now it makes sense.
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6087 Posts
 Posted 06/29/2018  6:05 pm  Show Profile   Bookmark this reply Add Mark1959 to your friends list Get a Link to this Reply
That's just a close up of lizard skin!


My biggest fear is that when I die my wife will sell all my coins for what I told her I paid for them.

Working on Whitman Large Cent date set album 1793-1857 (57 holes filled of 64 total) now come the "toughies" - yikes!
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15021 Posts
 Posted 06/30/2018  5:41 pm  Show Profile   Bookmark this reply Add BadThad to your friends list Get a Link to this Reply
Plating bubbles, normal:


Lincoln Cent Lover!
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 Posted 07/11/2018  03:31 am  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
These are called Plating Bubbles. It's very common on Copper plated Zinc planchets. http://www.error-ref.com/blisteredplating/
Errors and Varietys.
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 Posted 07/11/2018  08:16 am  Show Profile   Bookmark this reply Add just carl to your friends list Get a Link to this Reply
Similar bubbles found on many pennies from the 80's to 90's. Mint was still learning how to plate coins I guess.
just carl
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 Posted 07/11/2018  09:20 am  Show Profile   Bookmark this reply Add SilverDollar2017 to your friends list Get a Link to this Reply
It's just some plating bubbles. Doesn't increase the value of the coin.
Collector of all classic US coinage.

How to identify cleaned coins: http://goccf.com/t/319679
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752 Posts
 Posted 07/12/2018  3:44 pm  Show Profile   Bookmark this reply Add Kurrency Ken to your friends list Get a Link to this Reply
Zincoln zits!

KK
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