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No Date Visible - Determining 92.5% From 80% Silver George V Coins?

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Alexer's Avatar
Canada
2632 Posts
 Posted 04/26/2016  3:22 pm  Show Profile   Bookmark this reply Add Alexer to your friends list Get a Link to this Reply
My first reply simply points out that Yes there is a way..if..you really..need to..know.

Otherwise the truth of the matter is..

Quote:
When the George coins are that well worn a total and absolute waste of ever decreasing time

IMHO
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kuh_85's Avatar
Canada
2366 Posts
 Posted 04/26/2016  3:49 pm  Show Profile   Bookmark this reply Add kuh_85 to your friends list Get a Link to this Reply
I vaguely remember a couple of years back some people were playing with a sound analyzing smartphone app and the ring test. I think there were some youtube videos on it if you want to see what they came up with. Enjoy finding out. Coin collecting isn't just about profit, whatever some dealers may insist... ;-)
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GregJG's Avatar
Canada
257 Posts
 Posted 04/26/2016  4:17 pm  Show Profile   Bookmark this reply Add GregJG to your friends list Get a Link to this Reply
Argh, that app is called CoinTrust and they want $13.99 for it. Nope :P
I love the idea though! They use frequency plots of what sounds the coin makes as it spins/rattles/settles on a hard surface. And compare that to a known frequency response.

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*** Edited by Staff to add YouTube tags. [youtube][/youtube] Please use them in the future. We prefer embedded video. ***
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AgCoinAu's Avatar
Canada
3049 Posts
 Posted 04/26/2016  4:24 pm  Show Profile   Bookmark this reply Add AgCoinAu to your friends list Get a Link to this Reply
I think I saw on the american thread something about using a piece of toilet paper over top of the coin and you could tell if it was clad or 40%... perhaps that would work here.. but can't find the thread or how the test works ..
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llewellin's Avatar
United States
1005 Posts
 Posted 04/26/2016  8:58 pm  Show Profile   Bookmark this reply Add llewellin to your friends list Get a Link to this Reply
It would be worth trying the tissue paper test; perhaps the 80% silver might appear a little darker behind the tissue. The ring test sounds like a neat idea to try, but I would be afraid that coin geometry might confound the test too much; it is possible that the ring depends more on the level of wear than the composition.

For the magnet test, it's not an issue of para/diamagnetism. Both copper and silver are weakly diamagnetic, and this effect would be exceedingly difficult to test, without a water bath or extremely sensitive scale. What I was thinking is to drop the coin down a chute of sorts so it passes in close proximity to a very large and strong NdFeB magnet. If it is sterling silver, it should slow down more than if it is 80%, since the alloying with copper should decrease electric conductivity and subsequent eddy currents when passing through the magnetic field.

If you have a big magnet and can figure out a timing rig or sensitive way to separate the two based on how the magnet slows the coin, this would be my first go at separating them non-destructively.
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