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#1
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Toning on ANACS graded coins
Hi all,
Is it my imagination, or do coins in ANACS holders tend to tone gold around the rims? -- Mike |
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#2
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#3
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Gary Loveless wrote:
On 22 Apr 2004 10:45:33 -0700, (Michael Ng) wrote: Hi all, Is it my imagination, or do coins in ANACS holders tend to tone gold around the rims? -- Mike Not sure.........OLD SCHOOL NGC holders do this, I have seen this on Morgan Dollars............ Gary Hmmmm...I wonder what that will do to all of those beautifully toned coins in holders over the next 20 years? Jack |
#4
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In article tr%hc.16914$GR.2464992@attbi_s01,
Jack wrote: Hmmmm...I wonder what that will do to all of those beautifully toned coins in holders over the next 20 years? Jack I was wondering taht same thing. I read somewhere that "all toned coins eventually tone all black." Is that nonsense? Scot Kamins -- "A democracy is a sheep and two wolves deciding on what to have for lunch.Freedom is a well armed sheep contesting the results of the decision." - Benjamin Franklin |
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Scot Kamins wrote:
In article tr%hc.16914$GR.2464992@attbi_s01, Jack wrote: Hmmmm...I wonder what that will do to all of those beautifully toned coins in holders over the next 20 years? Jack I was wondering taht same thing. I read somewhere that "all toned coins eventually tone all black." Is that nonsense? No, it's true, but it doesn't happen overnight, even if you leave the silver out in the open. Silverware tarnishes, that's why tarnish removers exist. The process should be a lot slower in a holder. I don't know how airtight the holders from the slabbers are, but if they are perfectly airtight, the coin shouldn't change. The "Toning" is just a thin layer of tarnish. A very thin layer maybe molecules thick, diffracts light and gives color. A thick layer is opaque and the coin appears dark. One of these days I'm going to sacrifice one of my Morgans on the altar of numismatic science and briefly take a blowtorch to the edge of one and see if I can duplicate the so-called "bag toning". Jack |
#6
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"Jack" wrote in message news:dE8ic.10758$aQ6.872293@attbi_s51... Scot Kamins wrote: In article tr%hc.16914$GR.2464992@attbi_s01, Jack wrote: Hmmmm...I wonder what that will do to all of those beautifully toned coins in holders over the next 20 years? Jack I was wondering taht same thing. I read somewhere that "all toned coins eventually tone all black." Is that nonsense? No, it's true, but it doesn't happen overnight, even if you leave the silver out in the open. Silverware tarnishes, that's why tarnish removers exist. The process should be a lot slower in a holder. I don't know how airtight the holders from the slabbers are, but if they are perfectly airtight, the coin shouldn't change. The "Toning" is just a thin layer of tarnish. A very thin layer maybe molecules thick, diffracts light and gives color. A thick layer is opaque and the coin appears dark. One of these days I'm going to sacrifice one of my Morgans on the altar of numismatic science and briefly take a blowtorch to the edge of one and see if I can duplicate the so-called "bag toning". Jack Hey, Jack, rather than trying an "artificial" toning experiment, why not get a canvas bag or a piece of canvas and wrap a couple BU Morgan in it. You can leave instructions to your grandkids to post their observations here in 75-100 years. My grandkids would be enlightened. G Should those of us who favor toned coins perhaps be storing our MS silver coins in canvas holders? Bruce |
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On Fri, 23 Apr 2004 02:45:45 GMT, Jack
wrote: Gary Loveless wrote: On 22 Apr 2004 10:45:33 -0700, (Michael Ng) wrote: Hi all, Is it my imagination, or do coins in ANACS holders tend to tone gold around the rims? -- Mike Not sure.........OLD SCHOOL NGC holders do this, I have seen this on Morgan Dollars............ Gary Hmmmm...I wonder what that will do to all of those beautifully toned coins in holders over the next 20 years? Jack NGC changed the way they encapsulated the coins, they may claim that this "probably wont happen". Then again it all depends if you like toning or not?? Patina = Toning , right? Gary |
#8
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Gary Loveless wrote:
Jack Hmmmm...I wonder what that will do to all of those beautifully toned coins in holders over the next 20 years? Jack NGC changed the way they encapsulated the coins, they may claim that this "probably wont happen". Then again it all depends if you like toning or not?? ICG had a test done when they introduced the intercept Shield slabs. The test subjected Intercept Shield, PCGS and NGC slabs to accelerated aging. The NGC slabs fared much better than the PCGS slabs in both this test and a previous test conducted in 1996. Here's the ICG article on the test: http://www.icgcoin.com/p001213.htm ++++++++++ Phil DeMayo - always here for my fellow Stooge When bidding online always sit on your helmet Just say NO to counterfeits |
#9
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Phil DeMayo wrote:
Gary Loveless wrote: Jack Hmmmm...I wonder what that will do to all of those beautifully toned coins in holders over the next 20 years? Jack NGC changed the way they encapsulated the coins, they may claim that this "probably wont happen". Then again it all depends if you like toning or not?? ICG had a test done when they introduced the intercept Shield slabs. The test subjected Intercept Shield, PCGS and NGC slabs to accelerated aging. The NGC slabs fared much better than the PCGS slabs in both this test and a previous test conducted in 1996. Here's the ICG article on the test: http://www.icgcoin.com/p001213.htm That's wonderful, but their "aging" test appears to be to subject the coin in the holder to some tarnishing gases and see if they leak through the gasket. It seems to me that this won't tell you anything about toning caused by diffusion from the plastic holder itself. I think this may be important because of toning that I've seen occur just letting coin sit in a plastic cup, and I've heard of the pvc damage that occurs from some vinyl holders. Jack |
#10
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Jack merde44spinks wrote:
That's wonderful, but their "aging" test appears to be to subject the coin in the holder to some tarnishing gases and see if they leak through the gasket. It seems to me that this won't tell you anything about toning caused by diffusion from the plastic holder itself. Slabs are made from inert materials. I think this may be important because of toning that I've seen occur just letting coin sit in a plastic cup Was that an open plastic cup? if so, it was noxious things in the air that toned the coin, most notably hydrogen sulphide. and I've heard of the pvc damage that occurs from some vinyl holders. Contrary to what you may hear from one questionable grading service, slabs do not contain any PVC (vinyl). ++++++++++ Phil DeMayo - always here for my fellow Stooge When bidding online always sit on your helmet Just say NO to counterfeits |
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