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 Replies: 13 / Views: 2,632 |
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Valued Member
United States
484 Posts |
As I was doing an experiment on badly corroded pennies I found this dime. Originally I figured it was just discolored from environmental damage but after it was cleaned I realized that it was actually copper. So I weighed it and surprisingly it's weight is only 2.17 g. Since it's not struck on a cent planchet I am wondering what is going on. Is it missing the clad layers or was it on the wrong metal? Help is much appreciated     |
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Pillar of the Community
United States
2869 Posts |
I don't think it can be a layer only. I think it is just damaged. The layer would weigh less than that.
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Valued Member
 United States
484 Posts |
I'm not sure I know that I looked up something that said one side layer is around .05 so I figured if both layers were missing that would basically be the missing weight
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Pillar of the Community
 United States
4618 Posts |
It looks like it was buried in acidic soil. The strike is strong, so I really don't think it was missing one or both clad layers. It is possible to have a dime struck on just the copper core, but that is so rare that only a few have ever been certified. I think it's just Post Mint Damage. PMD ANA ID: 3203813 - CONECA ID: N-5637 Clean a coin that may be worth collecting? Please DON'T! When in doubt, leave it dirty!! 
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Bedrock of the Community
United States
94367 Posts |
Agree, this appears to be a dug coin.
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Valued Member
United States
484 Posts |
I did get it from an abandoned shed in a broken jar with a bunch of corroded Lincoln Cent. So that would cause the clad layers to fall off making it look copper? |
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Pillar of the Community
United States
4618 Posts |
I think the clad layers are still there, just deeply corroded. If it were a case of the clad being lost after the strike, you wouldn't have the sharp detail on the devices that you see here.
ANA ID: 3203813 - CONECA ID: N-5637 Clean a coin that may be worth collecting? Please DON'T! When in doubt, leave it dirty!!
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Valued Member
United States
484 Posts |
Okay, understandable considering how I found them. Thanks everyone for the help.
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Pillar of the Community
Canada
6244 Posts |
A nice clean will show the nickel. The red color it is not cooper color. Yoko is right.
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Valued Member
United States
484 Posts |
Silviosi, a good cleaning is what I did to find out that this was a Dime.  Edited by My2cent
07/29/2021 8:55 pm
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Pillar of the Community
Canada
6244 Posts |
When I say good clean it is the process of restoring the coins. Sorry but outside a laboratory equip for restoration it is not possible.
You have a lot of coins like this. A no friction ultrasound could help. The rest sorry will cost you to much and no guaranty you will find a jack.
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Valued Member
United States
484 Posts |
Time and Money I don't have you are correct. It was still fun while it lasted.
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Valued Member
United States
221 Posts |
My2Cent,
I tried explaining this in another thread earlier today. The cupronickel alloy cladding is only 25% nickel. The rest of the cladding is copper. It doesn't take much nickel to make the copper look pale. Our nickels are also only 25% nickel overall.
Now then: in a corrosive environment such as where you found the coins or the cleaning baths you used, a couple of things probably can happen which will enrich the surface in copper and make it look more like pure copper. This process is called dealloying.
For one, it could happen that the nickel is oxidized faster than the copper. Another is that both elements go into solution, but the copper plates onto the coin as conditions change. Your cleaning solutions might have been especially loaded in copper after you dissolved all of the copper corrosion products off all those cents.
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Valued Member
United States
484 Posts |
Very interesting, thanks for your intelligence on this matter numiscrat
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Replies: 13 / Views: 2,632 |
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Posted 07/28/2021 5:40 pm
