Penny oxidation

Dropkickweasel

Greenie
Oct 5, 2018
11
22
Illinois
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Fisher F22
Primary Interest:
Metal Detecting
A few pennies I've found, such as this one, have what appear to be large blisters on the side where the face is. Is this a mineral deposit that can be removed, or has the copper in the pennies somehow bubbled up and destroyed the image? Just want to know if I can clean these lumps off and if so, how? Thanks!

20181104_120055.jpg
 

Back-of-the-boat

Gold Member
Apr 18, 2013
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I cant make out the year is that a newer coin or older.
 

Charlie P. (NY)

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Feb 3, 2006
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I don't think that's oxidation. I think that is the acids and nitrogen in the soil dissolving the surface.

Any cent minted after 1982 is self destructive in moist soil with any nitrate fertilizers or natural acids around.

Although you appears to have an "18xx" date. But that, again, could be copper and acids reaction.
 

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Dropkickweasel

Greenie
Oct 5, 2018
11
22
Illinois
Detector(s) used
Fisher F22
Primary Interest:
Metal Detecting
It's hard to tell from the picture, but it's from 1868. It was under a farm field since who knows when so I'm sure it's been exposed to all kinds of fertilizer.
 

Hillbilly Prince

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Aug 9, 2018
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I don't think that's oxidation. I think that is the acids and nitrogen in the soil dissolving the surface.

Any cent minted after 1982 is self destructive in moist soil with any nitrate fertilizers or natural acids around.

Although you appears to have an "18xx" date. But that, again, could be copper and acids reaction.

I have been wondering about that. Found a lot of newer pennies in the backyard and they are toast. The quarters and dimes are better.
 

xr7ator

Gold Member
Sep 2, 2011
5,238
7,264
Denver, Colorado
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Post 1982 pennies are zinc with copper plating. they don't last long in the ground.

On the IHP, removing the crust will just show you a pitted surface. The crust used to be part of the penny. Once removed, it will be just as ugly, usually.
 

smokeythecat

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Nov 22, 2012
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It's toast. Lately I've been leaving the horrible ones at the car vacuum as some elderly folks go there and get them. I also leave bigger change. They just won't clean up.
 

Back-of-the-boat

Gold Member
Apr 18, 2013
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It's toast. Lately I've been leaving the horrible ones at the car vacuum as some elderly folks go there and get them. I also leave bigger change. They just won't clean up.

Your the one who keeps leaving me pennies at the car vacuum:laughing7:
 

smokeythecat

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Nov 22, 2012
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Not in California, but I was there exploring ice hockey and the San Andreas fault last weekend.
 

Oct 5, 2014
31,886
35,426
Massachusetts
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Looks like an IH cent from 18??. The ones I find in farm fields are usually toast, but ones found near a home without chemicals or fertilizer are usually in better shape.

Good Luck in your next hunt! :icon_thumleft:
 

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Dropkickweasel

Greenie
Oct 5, 2018
11
22
Illinois
Detector(s) used
Fisher F22
Primary Interest:
Metal Detecting
Damn. I kind of figured there'd be no cleaning it up. I'm just grateful that I was able to see the date still. Thanks for the input everyone!
 

mrwilburino

Hero Member
May 7, 2010
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Northern Ohio
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That's how my indians and older wheats usually look. About a year in olive oil helps get some of the crud off.
 

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