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Silver Coin: Real Or Fake?

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Petrus's Avatar
Belgium
2895 Posts
 Posted 02/10/2016  11:30 am Show Profile   Bookmark this topic Add Petrus to your friends list Get a Link to this Message Number of Subscribers
I would like to make a list of all tests that can be done to find out is a coin is real or fake.
Here is what I could think of:
- feels and looks
- comparing weight and dimension (catalogs)
- ping test
- tissue test
- magnet test (attraction to magnet)
- slide test (nodymium magnets)
- calculating the density
- chemical tests:
- ?
- ?
- ?

Did I forget some tests?
Any comment is welcome
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nss-52's Avatar
United States
54283 Posts
 Posted 02/10/2016  1:02 pm  Show Profile   Check nss-52's eBay Listings Bookmark this reply Add nss-52 to your friends list Get a Link to this Reply
- seller integrity test?
- compare to genuine
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See my topic on Mexican Numismatic Medals (click here)
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ace_ftw's Avatar
Canada
1747 Posts
 Posted 02/10/2016  2:40 pm  Show Profile   Bookmark this reply Add ace_ftw to your friends list Get a Link to this Reply
XRF, 100%
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Petrus's Avatar
Belgium
2895 Posts
 Posted 02/11/2016  10:35 am  Show Profile   Bookmark this reply Add Petrus to your friends list Get a Link to this Reply
XRF, yes, but to costly for a coin collector as I.
And I forgot the ice-test
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Spence's Avatar
United States
34430 Posts
 Posted 02/11/2016  9:50 pm  Show Profile   Bookmark this reply Add Spence to your friends list Get a Link to this Reply
i think that a nice loupe or even better a microscope can be used to look for flow lines (evidence of a coin being struck as opposed to being cast).
"If you climb a good tree, you get a push."
-----Ghanaian proverb

"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz
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sel_69l's Avatar
Australia
21788 Posts
 Posted 02/11/2016  10:26 pm  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
- surface characteristics (cast or struck, evidence of bubbles or dimples)
- stylistic cahracteristics
- detailed visual comparison alongside a known genuine example (for example, letter shapes)
- sharpness of detail
- exact comparison of diameter with known genuine
- 'mushiness' of detail. with each generation of copy, detail is lost
- provenance (already mentioned)
- edge milling detail
- consistency of rim denticles
- edge joining of two halves
- altered details from a common genuine coin



List still incomplete,
there are more, but these came immediately to mind.
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Libertad's Avatar
Canada
3692 Posts
 Posted 02/11/2016  11:37 pm  Show Profile   Bookmark this reply Add Libertad to your friends list Get a Link to this Reply
- How it sounds
- How it bends (destructive)
- Visual color from oxidation, acid, polishing, tumbling (destructive)
- How it melts (destructive)
- Loupe the darn thing!
- Cartwheel effect! (from polished dies)
- How it tastes (okay just kidding)
- Did anyone mention weigh the coin? I've spotted fakes just from this (and diameter and thickness of coin).

@dspenciner: I think you're referring to mold lines, which will tell you if the coin was made using a mold (and not taken out - lazy) . "Casting/flow lines" would more likely refer to the chilling effect if the metal or mold is too cold when casting, so you will get wavy ripples on the surface of the metal around a portion that will seem shinier but may contain incomplete fills, therefore making the metal ball up, especially when the pattern becomes very thin. Look at any material when it melts, as it will become a ball (hair, skin, paper, metal, plastic, etc). Anyways, a cast item needs a gate/sprue, therefore to remove hat artifice one must grind it off and polish the area. So if one area looks super shiny for no reason, bingo, hence the cartwheel effect that is visible on ZERO castings ever. (I cast noble metals daily for business and pleasure.)
Edited by Libertad
02/11/2016 11:41 pm
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Susuman's Avatar
United States
595 Posts
 Posted 02/12/2016  12:23 am  Show Profile   Bookmark this reply Add Susuman to your friends list Get a Link to this Reply
Don't forget date. Some fakes have dates that are not the same as what the real coin would have.

If the word 'COPY' is on the coin
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