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nelson
New Member
USA
3 Posts |
 Posted - 03/11/2010 : 02:07:52
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When i find an old penny the has corrosion on it is it gonna spreed to the other coins when i re-roll them?
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ingreenlight
New Member
USA
24 Posts |
Posted - 03/11/2010 : 03:54:13
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| excellent question... anyone? I cant see how it would, but im not sure. I always freak out when i see a nasty greenie in my copper pile. |
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Dave
Penny Pincher Member
156 Posts |
Posted - 03/11/2010 : 05:21:51
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| The same question was asked @ month or 2 ago. We were advised to keep them sperated because the corrosion will spread to other coins. I have a bag of nasty looking copper pennies. |
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beauanderos
1000+ Penny Miser Member
USA
2408 Posts |
Posted - 03/11/2010 : 09:25:05
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try it and find out. I think humidity would have to be a factor as well, but try an experiment. Get ten different ugly abe's and sandwich them between two clean coppers. Set the ten piles aside where they won't be disturbed for six months and then see what happens. Who wants to take on this science project and track the results? Volunteers?  |
Hoard now and hold on!
http://coppermillions.blogspot.com/
http://wherewillyoubein2012.blogspot.com/ |
Edited by - beauanderos on 03/11/2010 09:26:06 |
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slickeast
1000+ Penny Miser Member
USA
2533 Posts |
Posted - 03/11/2010 : 15:17:11
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quote:
Originally posted by beauanderos
try it and find out. I think humidity would have to be a factor as well, but try an experiment. Get ten different ugly abe's and sandwich them between two clean coppers. Set the ten piles aside where they won't be disturbed for six months and then see what happens. Who wants to take on this science project and track the results? Volunteers?
Sounds like a perfect job for........beauanderos |
You don't have to be the BEST you just have to be.......SLICK
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PointOmega
Penny Sorter Member
50 Posts |
Posted - 03/11/2010 : 16:03:47
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| I know this is copper forum and not silver, but while on the subject of corrosion, can those filmy green spots on silver half dollars spread? Somebody on another sight said to leave them in summer sunlight for 2 days at it would burn off. Kind of think he was hoping I'd leave them outside where he would find them. Any way, can that corrosion spread through the other silver coins? |
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PreservingThePast
1000+ Penny Miser Member
USA
1572 Posts |
Posted - 03/11/2010 : 16:16:12
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quote:
Originally posted by PointOmega
I know this is copper forum and not silver, but while on the subject of corrosion, can those filmy green spots on silver half dollars spread? Somebody on another sight said to leave them in summer sunlight for 2 days at it would burn off. Kind of think he was hoping I'd leave them outside where he would find them. Any way, can that corrosion spread through the other silver coins?
Found this info for you:
Silver coins, when newly minted, have a bright silvery-white surface. A chemically active metal, silver tends to tone deep brown to black. Circulated silver coins will often have a dull gray appearance, sometimes with a deep gray or black area. Silver coins acquire a blue, green, or violet oil-like tone through tarnishing that can enhance the appearance and desirability of an old silver coin and should not be cleaned.
Above info from this link:
You must be logged in to see this link. |
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PreservingThePast
1000+ Penny Miser Member
USA
1572 Posts |
Posted - 03/11/2010 : 16:23:17
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quote:
Originally posted by nelson
When i find an old penny the has corrosion on it is it gonna spreed to the other coins when i re-roll them?
Found this info for you:
THE SPREADING OF VERDIGRIS
In some ways verdigris is like a bacterium or virus. It's obvious after looking at the chemistry involved that it can spread from coin to coin by contact. It's a simple matter of the verdigris infected coin being a donor of the corrosive elements. Since verdigris is an active spot on the coins surface that is constantly undergoing change based on composition, hydration and temperature, the chemical equilibriums dictate that some of the counter-ions (acetate, hydroxide, carbonate, etc.) will be present. If that verdigris stays in contact with a fresh copper surface, some of those ions will naturally migrate. Once they have moved to the new surface, cupric compounds will start to form producing new verdigris. As the spot is continually fed by the donor coin and by exposure to air and water, the verdigris will grow. Isolation of coins from the verdigris feed materials is of utmost importance to the numismatist!
Collectors should always separate verdigris infected coins and quarantine them! They will act as a catalyst for the continual formation of verdigris via ion migration.
Here's an example of how verdigris can spread by contact. This "mated-pair" was found inside of an old roll of coins. The coins were literally stuck together. The rest of the coins in the roll were in excellent condition so it is obvious that the verdigris on the problem coin prompted the formation of verdigris on the non-infected coin.
This is a picture from above the mated-pair:
The above info came from this link:
You must be logged in to see this link. br /
There were some good photos as examples so you might wish to visit the link to see them.
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beauanderos
1000+ Penny Miser Member
USA
2408 Posts |
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Kurr
1000+ Penny Miser Member
2906 Posts |
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collectorofmanythings
New Member
2 Posts |
Posted - 03/12/2010 : 19:06:13
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| although I do not advocate the cleaning of coins for numismatic purposes......what about the idea of utilizing a tumbler to clean "dirty" coppers to store....? |
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beauanderos
1000+ Penny Miser Member
USA
2408 Posts |
Posted - 03/12/2010 : 19:59:10
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I think it's more trouble than it's worth. Like throwing a minnow back because it doesn't meet the minimum length as a keeper. Don't contaminate your keepers with one cent losers! Just throw the ugly abe's back and looker for some better conditioned cents to keep. It's a waste of your time to clean them. Sort more, instead  |
Hoard now and hold on!
http://coppermillions.blogspot.com/
http://wherewillyoubein2012.blogspot.com/ |
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PointOmega
Penny Sorter Member
50 Posts |
Posted - 03/14/2010 : 16:04:37
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| thank you, Preserving TP |
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corrosion
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