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Date: Wed, 15 May 2002 16:34:00 -0700 (PDT)
Subject: Re: [Colonial Numismatics] Niton Corp visit and XRF analyzer
To: colonial-coins@yahoogroups.com
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From: George FUld <fuldy2000@yahoo.com>
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--- rg5turc@aol.com wrote:
>
>
> Hello All,
>
> I've returned from my visit with the Niton Corp.
> Many thanks to their
> Regional Sales Manager, Monique Lefebrve,
> Applications Scientist, Volker
> Thomsen and Metalurgist, Peter Faulkner.
>
> To begin with the pic you see posted is that of
> Volker performing the tests
> on the coins I brought and due to time constraints
> only 40 coins were tested
> which provided a taste of what could be done but not
> significant numbers to
> provide any true scientific data base. To start
> with the NJ's, Vt's, Ct's,
> Machins Mills, Regal G-II and G-III as well as the
> struck counterfeit G-II
> and G-III all had reading's of pure copper (Cu) from
> a low of 98.2% to a high
> of 99.7%. Volker and Peter explained and reafirmed
> what had already had been
> discussed between myself and Skip Smith that these
> analyzer's can only
> perform a percentage reading of the elements present
> but would not be able to
> identify where the source of the copper came from,
> whether the ore came from
> England, Sweden or the US. As explained to me even
> copper ore within the
> same vein will have differences from different
> sections of the vein as well
> as depending on what year the ore was mined. So
> from a very limited
> structure I must agree that tracing a particular
> coin to a particular copper
> source is not realistic.
>
> The area that truly provided interest and excitement
> was in the testing of
> the cast coins or coins struck from cast blanks.
> There is too much to put
> into just one post so I will begin with my G-I 1723
> cast 1/2d and a
> remarkable remark from Volker when the test results
> appeared on the screen.
> The results on the 1723 are: Cu (copper) 85.2%, Zn
> (zinc) 2.4%, Pb (lead)
> 6.97% and Sn (tin) 4.58% and Volker's immediate
> comment of "Gun Metal". I
> went on to explain to him that coinage of James the
> II was minted from gun
> metal and is nicknamed appropiately " Gun Money".
> he explained the the ratio
> for Gun Metal is Cu 85%, Zn 5%, Pb 5% and Sn 5%.
>
> Tonight I will post the information and pic on my
> Machins V14-84A as the
> readings came back of that of a cast coin as well as
> some interesting results
> on the Hibernia's. I explained to the folks at
> Niton Corp that a good numver
> of coins needed to be tested and they of course
> provided rental fee's and
> licensing fee's. I will contact Ray Williams on
> this to be brought up at C-4
> in case interest might be there to resume further
> testing on cast coinage.
> When Volker and Peter had departed, Monique did
> offer to spend one day at C-4
> in November testing coins at no charge providing the
> club was kind enough to
> take her out to lunch and provide her an area to
> perform the testing.
> Volunteers would be needed to sit with Monique in
> order to record the test
> results and I leave it to Ray Williams to organize
> this if there is enough
> interest to do so.
>
> Ray T.
>
Dear Ray:
I had discussed at some length with Skip about using
analysis on blacksmith tokens to determine the origin.
He was quite discouraging as you noted on the
colonials. It sounds good, but unfortuantely on copper
we have little hope. Would appreciate seeing a
summary of all your test results for my files.
thanks,
George Fuld
> ATTACHMENT part 2 application/zip name=Volker
Thomsen (Nito17.ZIP
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