[Colonial Numismatics] XRF at C4 上市 Deposited
Re
- From mhodder@theworld.com Wed Nov 06 15:58:57 2002
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Date: Wed, 06 Nov 2002 23:58:57 -0000
To: colonial-coins@yahoogroups.com
Subject: Re: [Colonial Numismatics] XRF at C4
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Ray:
See my reply to Clem's query. Unless the coin is cleaned down to
the bare copper, the results will be contaminated by surface
impurities and the Blue Ribbon residue. Multiple readings at
different points can spread the "error" and so reduce it. but not
eliminate it entirely.
Mike H
--- In colonial-coins@y..., rg5turc@a... wrote:
> Hi Mike,
>
> Thank you for the notes and all of my prior testing has been
done by cleaning
> the coin first with Blue Ribbon and the measurements on each
coin is taken at
> 2 different points on the obverse and 2 separate points on the
reverse of
> the coin. Skip Smith had sent me a coin with known composition
to calibrate
> the instrument before testing/measurements begin.
>
> Take care........Ray T. - 2002-11-06
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