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is my coin fake or not ?

 
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Pillar of the Community
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United States
4210 Posts
 Posted 05/18/2018  06:56 am  Show Profile   Check Foxwoods Man's eBay Listings Bookmark this reply Add Foxwoods Man to your friends list Get a Link to this Reply

Quote:
Unlike in other testing methods, plating and surface features do not significantly impact the unit's ability to measure the underlying metal. Using electromagnetic waves that penetrate deeply into the coin or bar, plating and surface features are largely ignored, and the main body of metal assessed.
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United States
12813 Posts
 Posted 05/18/2018  07:11 am  Show Profile   Check nss-52's eBay Listings Bookmark this reply Add nss-52 to your friends list Get a Link to this Reply
Well, if the coin is split in two, then the inside can be analyzed.
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United States
1094 Posts
 Posted 05/18/2018  11:42 am  Show Profile   Bookmark this reply Add Alpha2814 to your friends list Get a Link to this Reply
For context, the quote that Foxwoods Man posted above is from https://sdbullion.com/gold-and-silv...a-metalytics -- the scanner there is not an XRF type; the underlying technology is "electromagnetic waves".

We have been talking about two different kinds of scanners. Most mentions on this board (at least those I've seen) have been about the XRF type. This is the first I've seen on this kind. It's a shame that the link doesn't go into more detail about how this tech works, and it was the first hit for the search terms I just used. I don't have time to research this any further right now -- it may be worth a separate thread.
Working on: Peace dollars (two to go), US type (Bust era), Chinese pandas, and San Francisco tokens.

"Fear is the enemy of will. Will is what makes you take action; fear is what stops you, and makes you weak."
-- Sinestro to (my avatar) Hal Jordan, "Green Lantern" (2011)
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4210 Posts
 Posted 05/18/2018  1:55 pm  Show Profile   Check Foxwoods Man's eBay Listings Bookmark this reply Add Foxwoods Man to your friends list Get a Link to this Reply
This was the suggestion as a possibility:


Quote:
The simple solution here would to have had the coins in question scanned.


..and a link to an expensive example was given. I just added an alternative offered by a reputable bullion dealer that I thought sounded reasonable, effective and not that expensive.
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United States
60291 Posts
 Posted 05/19/2018  01:09 am  Show Profile   Bookmark this reply Add jbuck to your friends list Get a Link to this Reply

Quote:
Well, if the coin is split in two, then the inside can be analyzed.



Quote:
the scanner there is not an XRF type; the underlying technology is "electromagnetic waves".
Not to be pedantic, but x-rays are electromagnetic waves.

Yeah, I know, the "electromagnetic waves" used in that device are probably not x-rays. Not sure what part(s) of the spectrum it uses.
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United States
360 Posts
 Posted 06/01/2018  3:10 pm  Show Profile   Bookmark this reply Add jst1dreamr to your friends list Get a Link to this Reply
Oh that breaks my heart to see. But now you know. BTW: those are great pictures when you see them enlarged. Nice job.
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France
11 Posts
 Posted 06/10/2018  5:09 pm  Show Profile   Bookmark this reply Add tawann to your friends list Get a Link to this Reply

Quote:
A genuine solid gold coin would not have a layer that peels back like shown in the image I posted yesterday.
*** Edited by Staff to add Quote tags. Please use them in the future. ***


Hi,

it is not really peeling, it is, I think, because of the tools I used to bend the coin.

At first I tried with only one cutting pliers, but it was too strong.

I needed an other cutting plier to bend 2 times the coin until it "broke"

Before to end cutted in two, The coin was tested with a touchstone. It was fine. My fear was it could be filled with tungsten.

What made me think that was the difference of weight beetwen what I've read on internet and what I have seen on my scale.


I learnt (few days later), from a very friendly gold seller, that The US Mint is known for not-so-exact measures and that my scale might be slightly off-balance too.

@jst1dreamr : this is true, the pictures look good. they were taken with an iphone X. I was impressed by its ability to focus so close to the coin (other than that the phone does not worth its price and the faceID is very bored..)
New Member
France
11 Posts
 Posted 06/10/2018  5:18 pm  Show Profile   Bookmark this reply Add tawann to your friends list Get a Link to this Reply
i repost it but for those who have very good ear, it was the ping test

https://vocaroo.com/i/s0ALin1qY3jr

this is true the "ping" is very pure and last long
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