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Subject 1 - Carbon Spots And Verdigris (1938 D Cent)

 
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 Posted 06/19/2021  12:41 am Show Profile   Bookmark this topic Add macmercury to your friends list Get a Link to this Message
My last post about cleaning...ahem conserving coin with the 1871 Indian cent showing only the after effect got mixed reviews, so this time I'm going to show the original condition before I attempt to save the coin.
As I mentioned few of the coins I got from this lot has some verdigris on copper coins, but this one also has the carbon built up, otherwise it is almost a red cent if the spots were not there.
Any ideas how you would handle this?




*** Edited by Staff to Add Year / Mintmark / Denomination to Title. Titles are Important! ***

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 Posted 06/19/2021  01:34 am  Show Profile   Bookmark this reply Add Pine Creek Coins to your friends list Get a Link to this Reply
Not an expert at cleaning coins, but there a a couple of things that I have used that may help in this situation. They most definitely will reduce the value of the coin as well. (Don't clean your coins!) The first thing that I suggest is a cleaner called "MS-70" It is not going to clean it as harshly as the other cleaner that I suggest. This second cleaner is extremely harsh on coins, only used in "extreme coin cleaning situations" this is a cleaner for toilets, It's called Bar Keepers Friend and it will strip everything from the coin. As always I avoid cleaning coins and do not recommend cleaning coins.
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 Posted 06/19/2021  03:10 am  Show Profile   Check westcoin's eBay Listings Bookmark this reply Add westcoin to your friends list Get a Link to this Reply
Nothing you can do that would help a copper coin this far gone. Believe me I've tried but once copper gets real corrosion under the surface it's a terminal case. I've got a beautiful Two Cent Piece that was struck from shattered dies and I bought it because it's the only one I've found from the die pairing in over 20 years of looking so far, I really hope to find one with out the dreaded copper rot disease on it.

This is after two weeks of soaking in Verdi-Care conditioner, and careful picking of the larger almost barnacle looking chunks of corrosion off. As you can see it still looks horrible, nothing I can do would ever make it better, I did make it so at least more of the die cracks would be visible, someday I will find better replacement I hope.



The carbon spotting is caused generally from moisture, the tiny little carbon speck you often find on copper coins, is usually from people talking over one and tiny almost microscopic droplets of spittle fall onto the coin only to turn into the flyspecks years later. Your Lincoln cent was possibly splashed with something in the past, maybe a soda can was opened near it? Whatever it was it stayed on the surface long enough to do serious irreparable damage, I'm afraid.

This old post from a few years ago shows some encouraging examples though. The copper seems to fair worse than silver or clad coinage. This was using an ultrasonic cleaner;
(Go to the last page #4)
http://goccf.com/t/194249



Here is a post I did showing what Verdi-Care can overcome on the green verdigris stuff.

http://goccf.com/t/378882
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Edited by westcoin
06/19/2021 03:19 am
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 Posted 06/19/2021  08:33 am  Show Profile   Bookmark this reply Add T-BOP to your friends list Get a Link to this Reply
Wow , a BU Wheat cent collectors Nightmare . I'm afraid to say that there is nothing you can do to remove all those black spots . Just another details coin .
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 Posted 06/19/2021  08:55 am  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
The '38-D cent is beyond hope and (to me) not worth spending the time on because of its low value.
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 Posted 06/19/2021  10:07 am  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
See my post for subject 2.
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 Posted 06/19/2021  12:49 pm  Show Profile   Bookmark this reply Add tdziemia to your friends list Get a Link to this Reply
I agree the '38-D cent is too far gone for help (I have a 1919 in high grade with similar problem)

However, you could always try putting it on eBay as ...

RARE, $$VALUABLE$$ LEOPARD SPOTS ERROR COIN !!!!

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 Posted 06/22/2021  08:13 am  Show Profile   Bookmark this reply Add panzaldi to your friends list Get a Link to this Reply
whatever happened here it corroded the surface of the coin where it landed. its not worth the time or effort to attempt anything unless you want to experiment
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 Posted 06/22/2021  08:50 am  Show Profile   Bookmark this reply Add jbuck to your friends list Get a Link to this Reply

Quote:
...unless you want to experiment
If ever there was a candidate, this may be it.
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 Posted 06/22/2021  09:00 am  Show Profile   Bookmark this reply Add ijn1944 to your friends list Get a Link to this Reply
I have a few otherwise BU wheat cents with the very same issue. I tried a number of approaches on one coin, with next to no discernable improvement. Aye, pesky copper barnacles you have.

With reference to the product 'Bar Keepers Friend', bar keeps may love it; coin collectors, not so much.
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 Posted 06/23/2021  6:25 pm  Show Profile   Check BadThad's eBay Listings Bookmark this reply Add BadThad to your friends list Get a Link to this Reply
Those are NOT carbon spots, they are the terminal stage of verdigris, the worst case scenario. When corrosion has progressed that far it cannot be removed without damaging the uncorroded surfaces. Also, as westcoin pointed out, the metal under the spots has formed a small pit and removing such a spot will still result in an ugly coin.
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 Posted 06/23/2021  8:04 pm  Show Profile   Bookmark this reply Add macmercury to your friends list Get a Link to this Reply
Coin has stage 4 terminal verdigris, I figured this was incurable, unless a miracle happens to reverse its cause in time.

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 Posted 06/23/2021  9:03 pm  Show Profile   Bookmark this reply Add tdziemia to your friends list Get a Link to this Reply
Splitting hairs, but this looks like cupric oxide to me, rather than verdigris (carbonate, chloride or acetate).
Edited by tdziemia
06/23/2021 9:04 pm
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