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What Are People's Thoughts On Using Verdicare On Zincolns?

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United States
1515 Posts
 Posted 01/23/2021  4:54 pm Show Profile   Bookmark this topic Add SamCoin to your friends list Get a Link to this Message
I have a few nice varieties with a little zinc rot setting in that I would like to mitigate if possible, however, I don't want to accidentally leave the surfaces of the coins looking disfigured/cleaned. What are people's thoughts on using VerdiCare on zincolns, especially ones that already have early-stage zinc rot?
My best finds:
1996 DDO-001/FS-101: http://goccf.com/t/372066
Two 2000 WAMs in a box: http://goccf.com/t/375240
1995 DDO-001/FS-101: http://goccf.com/t/376071#3225244
2000-D Maryland Quarter Rotated Die http://goccf.com/t/394553
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55970 Posts
 Posted 01/23/2021  5:11 pm  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
Doesn't sound like a good idea to me, especially since I don't think Verdi Care would have much effect on zinc rot. But it's cheap to experiment!

What say the chemists?
Edited by Coinfrog
01/23/2021 5:12 pm
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United States
1515 Posts
 Posted 01/23/2021  5:13 pm  Show Profile   Bookmark this reply Add SamCoin to your friends list Get a Link to this Reply
@CoinFrog I meant to address the verdigris that is still attacking the copper in the affected areas. Photo for reference.


My best finds:
1996 DDO-001/FS-101: http://goccf.com/t/372066
Two 2000 WAMs in a box: http://goccf.com/t/375240
1995 DDO-001/FS-101: http://goccf.com/t/376071#3225244
2000-D Maryland Quarter Rotated Die http://goccf.com/t/394553
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United States
8424 Posts
 Posted 01/23/2021  5:15 pm  Show Profile   Check GrapeCollects's eBay Listings Bookmark this reply Add GrapeCollects to your friends list Get a Link to this Reply
I've done it before, and done it on decently scarce coins. No issues on my end.
My best finds: 1999-WAM:http://goccf.com/t/332161 1988-RDV-6:http://goccf.com/t/335954#2873459 1986-Off-center: http://goccf.com/t/335952
1999 WAM #2:http://goccf.com/t/338710&whichpage=1
1981 Double Struck In Collar: http://goccf.com/t/350199&whichpage=1
ANA id: 3194067
My Type Set: https://www.NGCcoin.com/registry/co...sets/236574/
If you want to buy something or sell something or just talk, shoot me a PM!
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United States
1515 Posts
 Posted 01/23/2021  5:16 pm  Show Profile   Bookmark this reply Add SamCoin to your friends list Get a Link to this Reply
@GrapeCollects does it leave weird discolored marks in the areas that the verdigris was removed from?
My best finds:
1996 DDO-001/FS-101: http://goccf.com/t/372066
Two 2000 WAMs in a box: http://goccf.com/t/375240
1995 DDO-001/FS-101: http://goccf.com/t/376071#3225244
2000-D Maryland Quarter Rotated Die http://goccf.com/t/394553
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Australia
18362 Posts
 Posted 01/23/2021  6:46 pm  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
If they already show signs of rot, they are already gone. Therefore VerdiCare would just be a waste.

Just let to Zincolns continue to rot. That's what was intended.

The best use for rotted Zincolns is to return them in bulk to the bank. Issued currency, both bills and coins, are a liability on the U.S. Treasury.
If they cannot be reissued, the U.S. Treasury sustains the loss, not you.
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Canada
644 Posts
 Posted 01/23/2021  7:00 pm  Show Profile   Bookmark this reply Add silviosi to your friends list Get a Link to this Reply
The Zinc oxidation is amphoteric oxide. Cleaning this oxide from coins, with out scrubbing is with lemon juice. BUT, then after must be protected from next agents, in particular oxygen. Maybe an light oil film will help. Good Luck.

Follow some explications. (quote from chemistry)

PS the oxide it is silver color and do not affect the surfaces. it is just a reaction between the zinc and oxygen oxide. The surface of the pure metal tarnishes quickly, eventually forming a protective passivating layer of the basic zinc carbonate, Zn 5(OH) 6(CO3) 2, by reaction with atmospheric carbon dioxide.



Zinc burns in air with a bright bluish-green flame, giving off fumes of zinc oxide.[36] Zinc reacts readily with acids, alkalis and other non-metals.[37] Extremely pure zinc reacts only slowly at room temperature with acids. Strong acids, such as hydrochloric or sulfuric acid, can remove the passivating layer and subsequent reaction with water releases hydrogen gas.
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 Posted 01/23/2021  7:08 pm  Show Profile   Check GrapeCollects's eBay Listings Bookmark this reply Add GrapeCollects to your friends list Get a Link to this Reply

Quote:
@GrapeCollects does it leave weird discolored marks in the areas that the verdigris was removed from?


Not from my experience.
My best finds: 1999-WAM:http://goccf.com/t/332161 1988-RDV-6:http://goccf.com/t/335954#2873459 1986-Off-center: http://goccf.com/t/335952
1999 WAM #2:http://goccf.com/t/338710&whichpage=1
1981 Double Struck In Collar: http://goccf.com/t/350199&whichpage=1
ANA id: 3194067
My Type Set: https://www.NGCcoin.com/registry/co...sets/236574/
If you want to buy something or sell something or just talk, shoot me a PM!
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United States
15049 Posts
 Posted 01/23/2021  7:21 pm  Show Profile   Bookmark this reply Add T-BOP to your friends list Get a Link to this Reply
I definitely would not use Verdi-Care on Zinc rot Zincolns . Why waste a rare solution that is virtually impossible to get anymore . It will not help those coins .
Proud Member of The Black Sheep Squadron !
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United Kingdom
8358 Posts
 Posted 01/23/2021  7:36 pm  Show Profile   Check NumisRob's eBay Listings Bookmark this reply Add NumisRob to your friends list Get a Link to this Reply

Quote:
Just let to Zincolns continue to rot. That's what was intended.

As a matter of interest, is it reaction between the copper and zinc, or moisture getting between the two metals, which causes zincolns to rot? I was working in Austria in the summer of 2000 and used to visit banks to swap bills for the zinc 5-groschen coins, which were seldom seen in circulation and were due to be replaced by the Euro in 2002. I found numerous 5-groschen coins from the 1950s (the oldest was dated 1948) in quite reasonable condition. Occasionally they had a bit of white deposit on them, but it wasn't unusual to find a 50-year-old coin in VF.
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United States
1515 Posts
 Posted 01/23/2021  10:05 pm  Show Profile   Bookmark this reply Add SamCoin to your friends list Get a Link to this Reply
Is there any way to conserve a coin like this? I would rather not just let it disintegrate into zinc dust - even if it has little value, the coin in question is a very rare 1996 FS-101. Would be a shame for one of the only 10 or 20 known examples (from what I understand) to just crumble away.
My best finds:
1996 DDO-001/FS-101: http://goccf.com/t/372066
Two 2000 WAMs in a box: http://goccf.com/t/375240
1995 DDO-001/FS-101: http://goccf.com/t/376071#3225244
2000-D Maryland Quarter Rotated Die http://goccf.com/t/394553
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1675 Posts
 Posted 01/23/2021  10:23 pm  Show Profile   Bookmark this reply Add Rothery to your friends list Get a Link to this Reply
If I read this article right then removing the "zinc bloom" around exposed areas on the coin is actually a bad thing and the rot will only get worse. Now if Verdi-Care or any like product will seal the zinc from reacting with the carbon dioxide in the air I have no idea

Zinc Deterioration On Lincoln Cents:

http://www.error-ref.com/zinc-deter...ncoln-cents/
Everything can change in just one day.........

Best Lincoln roll find & Nicest WOODY find

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55970 Posts
 Posted 01/23/2021  10:52 pm  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
For those new to the collecting field, I would not recommend the unstable copper-plated Lincoln cents from 1983 to the present. They're prone to deterioration over time, even when left undisturbed or in slabs.
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4231 Posts
 Posted 01/23/2021  11:11 pm  Show Profile   Bookmark this reply Add Greasy Fingers to your friends list Get a Link to this Reply
If you have VC try it, then try coating with nose oil or spray a "test" Zincoln with clear lacquer. Back in the day many would lacquer their coins..Just my thought
I'm by no means a pro and will never claim to be...just my 2 cents
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 Posted 01/24/2021  08:00 am  Show Profile   Bookmark this reply Add T-BOP to your friends list Get a Link to this Reply
Greasy , It would still be a Details coin .
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In Memory of Fallen Black Sheep Mates .
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3620 Posts
 Posted 01/24/2021  08:19 am  Show Profile   Bookmark this reply Add ijn1944 to your friends list Get a Link to this Reply
Zinc rot and rot rates... I'd imagine the rate of zinc rot would vary, given the variety of environmental agents out there which a zinc coin could encounter. I've held on to select Zincolns for many years and have not been aware (visually) of any progression in the rate of rot (if they have any to begin with). I don't take any special care with them, other than placing in 2x2s, Danscos, and tubes. At this stage, I'm not concerned with coins turning to dust anytime soon. Can't say the same for a Zincoln lying in the dank grass of a ditch meandering along a Mississippi back road.

Saving an 'important' Zincoln could involve an acetone swim and quick VerdiCare treatment (if you have the stuff), then placing the coin in a quality 2x2 or capsule.
Edited by ijn1944
01/24/2021 1:09 pm
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