XRF at C4 上市 Deposited
Re
- From mhodder@theworld.com Wed Nov 06 15:54:55 2002
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Date: Wed, 06 Nov 2002 23:54:52 -0000
To: colonial-coins@yahoogroups.com
Subject: Re: XRF at C4
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From: "mike468hodder" <mhodder@theworld.com>
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Clem:
The electron beam that is aimed at the coin penetrates the
surface anywhere from 2 to 10 microns deep. The xylol or Care
coating on your coins is thicker than that and will influence the
readings. You'll probably have silicon showing up in the readout
from the degreaser or Care. The patina on the surface of the
coppers, which has formed over the centuries, will be what the
XRF reads unless the surface is really clean, i.e., cleaned down
to the bare red copper. The only way I know of around this, using
XRF, is to take multiple readings from different places and then
comparing them.
Mike H
--- In colonial-coins@y..., "Clement V. Schettino (Clem)"
<CopperClem@a...> wrote:
> Hey Mike,
>
> Just exactly what do you mean by "clean"? I typically
degrease/clean
> all my coppers with xylol (sp) then apply either "care" or
"blue
> ribbon" to return a little life, then remove most of the care
or BR
> leaving a fine coating behind for protection. Is that clean or
should
> one remove that protective coating, once again applying xylol
(sp),
> before subjecting to XRF?
>
> Thanks,
> Clem - 2002-11-06
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