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Coin XRF Testing - Anyone Had It Done?

 
 
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Pillar of the Community
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5664 Posts
 Posted 11/13/2018  12:07 pm Show Profile   Bookmark this topic Add Finn235 to your friends list Get a Link to this Message
So as a lot if you probably know, I collect ancient coins, and am drawn to the odd and unknown coins of antiquity. Specifically, I collect coins like my avatar, the Gadhaiya Paisa trade drachms of the 7th-14th centuries. To date, only three reference works exist for these coins, and only one of those authors actually tested the coins for their metallurgy.

I have discovered a handful of new types, some of which are missing pieces of the puzzle. As I write my reference guide for them, I would love to be able to articulate what the coin is made of, rather than what it looks like it's made of. That can't be done without an XRF machine or similar. My LCS has one, but when I tried to explain it to him, he said that his lawyer advised him to never use it except to validate potential purchases or make an offer on bullion. The only jewelers I can find in the area are chains like Kay or Jared - pretty sure they would laugh in my face. Looking around online, it seems the machines start at $6,000 and go up from there - not something I can afford!

I am willing to pay a small fee for the service, but not more than I spent on the actual coins. Has anyone had any success in getting coins tested? Are there any potential sources I am forgetting to ask?
My Collections:
Roman Imperial
http://goccf.com/t/348979
Japan Type set Tokugawa + Modern
http://goccf.com/t/348999
Indo Sassanian
http://goccf.com/t/322087
Bedrock of the Community
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28432 Posts
 Posted 11/13/2018  1:28 pm  Show Profile   Bookmark this reply Add John1 to your friends list Get a Link to this Reply
There are some members here on CCF that have a machine. I had one of my coins checked,but I forget who the member was
John1
( I'm no pro, it's just my humble opinion )
Searched 5+ Million Cents Since 1971
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 Posted 11/13/2018  3:55 pm  Show Profile   Check Andrew99's eBay Listings Bookmark this reply Add Andrew99 to your friends list Get a Link to this Reply
H&M Analytical offers a service to do it. You can get a quote online.
The collection is in your mind. Dispose of your albums and free your mind from the tyranny of holes.
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United States
28432 Posts
 Posted 11/13/2018  7:11 pm  Show Profile   Bookmark this reply Add John1 to your friends list Get a Link to this Reply
SPP-Ottawa has or had one,you may want to PM him.
John1
( I'm no pro, it's just my humble opinion )
Searched 5+ Million Cents Since 1971
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United States
5664 Posts
 Posted 11/13/2018  7:20 pm  Show Profile   Bookmark this reply Add Finn235 to your friends list Get a Link to this Reply
Thanks for checking!
My Collections:
Roman Imperial
http://goccf.com/t/348979
Japan Type set Tokugawa + Modern
http://goccf.com/t/348999
Indo Sassanian
http://goccf.com/t/322087
Valued Member
United States
122 Posts
 Posted 11/17/2018  8:44 pm  Show Profile   Bookmark this reply Add Captain Jack to your friends list Get a Link to this Reply
Type in XRF analysis into ebay... I saw someone posting services up there a few weeks ago to do analysis for you for like $20

https://www.ebay.com/itm/XRF-Analyz...i6:rk:1:pf:0
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 Posted 11/17/2018  9:42 pm  Show Profile   Bookmark this reply Add tdziemia to your friends list Get a Link to this Reply
Got any university connections? Sounds like potentially part of an undergraduate or masters thesis project.
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8536 Posts
 Posted 11/21/2018  09:25 am  Show Profile   Check SPP-Ottawa's eBay Listings Bookmark this reply Add SPP-Ottawa to your friends list Get a Link to this Reply
There are several journal papers that describe what you want to do... and lots of papers out there with XRF applications to coins:

https://www.sciencedirect.com/scien...073800003091
https://www.sciencedirect.com/scien...073897000704

This paper is available free (one of the co-authors posted it on his ResearchGate page)

https://www.researchgate.net/profil...RAY-TUBE.pdf

This book is available for free, also on the Editor's ResearchGate page:

https://www.researchgate.net/profil...a458731c.pdf
"Research is what I am doing, when I don't know what I am doing" --Wernher von Braun

Content of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_US

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8536 Posts
 Posted 11/21/2018  09:43 am  Show Profile   Check SPP-Ottawa's eBay Listings Bookmark this reply Add SPP-Ottawa to your friends list Get a Link to this Reply
Also, there is this book. John Deyell is from Ottawa, Canada and I helped him with his research by analyzing a bunch of his silver and gold coins from India.

https://www.amazon.com/Treasure-Tra...p/9350981335

I must caution you however, methodology and understanding the limitations of the XRF is important. This is not just black box technology - an understanding of the periodic table and orbital shells of various elements is crucial, as peak interferences can yield false readings. The instruments you see in coins stores and jewelry shops are mostly calibrated for detection of a few key elements in a series of yes/no tests... they are not to be relied upon for numismatic research.

The XRF is a powerful tool, but be aware of what exactly it is doing. There is a little bit of background reading here:

https://chem.libretexts.org/Textboo..._XRF_Spectra
"Research is what I am doing, when I don't know what I am doing" --Wernher von Braun

Content of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_US

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