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  1. #1
    us
    Jan 2008
    NorthWest Ohio
    Minelab E-Trac, and X-70
    4,812
    1174 times
    All Types Of Treasure Hunting
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    what causes pennies to do this?

    looks like Lincoln has a disease
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  2. #2
    us
    My goal for 2012 is a dozen Walking Liberty Halves

    Sep 2004
    Pittsburgh, Pa
    Tesoro Compadre & Tiger Shark
    2,815
    32 times

    Re: what causes pennies to do this?

    I don't know. Looks like he got a bad case of warts from the wicked witch.

    Could it be a chemical reaction of some kind with the environment.?? Just a guess.
    I Dig Everything...Even Pull Tabs.

  3. #3
    us
    Jan 2008
    NorthWest Ohio
    Minelab E-Trac, and X-70
    4,812
    1174 times
    All Types Of Treasure Hunting
    Banner Finds (2)
    Honorable Mentions (1)

    Re: what causes pennies to do this?

    yeah he does look all warty lol

  4. #4
    us
    Mar 2009
    Joliet, Illinois
    Whites XLT and Tesoro Tiger Shark
    200
    7 times

    Re: what causes pennies to do this?

    Possibly coins that were found detecting, cleaned in a tumbler, then put back in circulation. Just my theory. HH- Garbageman

  5. #5
    us
    Jan 2008
    NorthWest Ohio
    Minelab E-Trac, and X-70
    4,812
    1174 times
    All Types Of Treasure Hunting
    Banner Finds (2)
    Honorable Mentions (1)

    Re: what causes pennies to do this?

    hmmmm I have tumbled thousands of found pennies and they never bubbled up like that, they look more sand blasted when they are tumbled.

  6. #6
    us
    Mar 2009
    Joliet, Illinois
    Whites XLT and Tesoro Tiger Shark
    200
    7 times

    Re: what causes pennies to do this?

    Not damage from tumbling but the start of corrosion from being in the ground? I've had a lot of zinc cents that were in various stages of decomposing. HH- Garbageman

  7. #7
    us
    Sep 2008
    115

    Re: what causes pennies to do this?

    I'm not an expert but it could be gas bubbles created at the mint. Google it and you'll find some information.
    It's not really considered an error by most but they are a little out of the ordinary.

  8. #8
    us
    May 2009
    Wisconsin
    16

    Re: what causes pennies to do this?

    Yeah I noticed that also on pennies, I saw it a lot on the 1989 penny myself.

  9. #9
    us
    Dec 2006
    Washington, DC
    297
    All Types Of Treasure Hunting

    Re: what causes pennies to do this?

    This is caused by galvanic corrosion between the copper and zinc layers. Happens when moisture gets between the zinc core and the copper plating, usually by seeping in through microscopic cracks in the copper plating. It's very common when two electrolytic metals are in close contact like this. This is why the plated zinc cent is a stupid coin design from an engineering standpoint.

    Hey, US Mint... http://en.wikipedia.org/wiki/Galvanic_cell. Duh!
    RECENT FINDS:
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  10. #10
    trish76642

    Re: what causes pennies to do this?

    I have 2 that are Black, slightly larger than a normal penny, and bowed in the center...i still havent found and explanation for that.

  11. #11
    us
    da book worm--researcher

    Feb 2007
    callahan,fl
    delta 4000 / ace 250 - used BH and many others too
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    Re: what causes pennies to do this?

    the real cause of the problem would be ---being made out of crappy zinc with a thin copper "over plating"-- these new "junk" cents just do not hold up well -- they rot almost upon impact with the ground it seems -- I often find half eaten looking "stinking zilincons" as I call em -- if in a area where indain head cents most like are not to be found (say after 1930)-- like say the adverage newish tot lot --I notch out the cent (zinc) icon on my ace 250 to cull these cruddy half eatten junk coins -- (if in a older possible "indain head cents " territory area don't this however since indain heads can tend to come in under the "cents" (zinc ) icon --- but in you in "indian free areas" like say the above said --tot lot do it -- you will find older copper type cents (pre 1983) will still ring up but under the dime icon --the copper core of a clad dime seems very similar to the machine --so under dime icon it goes --

  12. #12
    Felinepeachy

    Re: what causes pennies to do this?

    LOL I call it penny pox.
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  13. #13
    us
    da book worm--researcher

    Feb 2007
    callahan,fl
    delta 4000 / ace 250 - used BH and many others too
    14,511
    761 times
    Honorable Mentions (1)

    Re: what causes pennies to do this?

    peach cat yours is real copper cent (being a wheatie its 1958 or earlier ) -- so thats called "copper or bronze disease" -- thus its very differant than zinc rot cents made after 1983 *

  14. #14
    Felinepeachy

    Re: what causes pennies to do this?

    Well I want to know why the heck they can't make a penny that lasts when a aluminum can buried in the ground for years comes out looking good as new? Maybe they should make pennies out of aluminum.

  15. #15
    XX
    XX is offline

    Jan 2008
    411

    Re: what causes pennies to do this?

    Op's pennies have been heated.

    Heat a couple of pennies and you will see the result.

    The result varies based on temperature and rate of heating.

 

 
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