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- From rogermoore435@yahoo.com Wed Nov 06 17:24:56 2002
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Date: Wed, 6 Nov 2002 17:24:55 -0800 (PST)
Subject: Re: [Colonial Numismatics] Re: XRF at C4
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From: Roger Moore <rogermoore435@yahoo.com>
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Dan, I think that this sort of rigorous approach is
needed in order to verify the multitude of diverse
results that will certainly be coming out over the
next few years, as these analysis techniques are used
at an increasing rate. Until the limits of the
analysis are explored in depth, including the effects
of various treatments, such as Blue Ribbon, the
results will always be questioned - as they should be.
I think the correlation coifficients of multiple
readings on the same coin will also be of importance.
Perhaps, rather than rushing into gathering a whole
lot of data on multiple coin types, at this point we
should be gathering data on the accuracy of the
measurements. I think it will be of importance to get
this data. Roger
--- Dan Freidus <freidus@wwnet.net> wrote:
> Roger,
>
> Not Brillo, that leaves mettalic traces. Seriously,
> for some work I
> have taken samples from the edge of a coin and first
> used sandpaper
> to remove corrosion (i.e. patina) from an area 2-3mm
> long on the edge
> before I remove a scraping of a few micrograms.
> Museums tend to be
> more receptive to this than collectors though there
> are exceptions.
> I think XRF requires a larger area so this sort of
> cleaning isn't
> practical. As far as accurate measurements go, the
> ideal is geting
> back to bare metal, i.e. the surface should only
> contain elements
> that were there in the 18th century. Compromise is
> the name of the
> game. But I do have some halfpennies that require
> no compromise.
> I'd be glad to sacrifice one that could be measured
> as is, then
> cleaned with xylol and remeasured and then cleaned
> with sandpaper and
> remeasured again and we can see how different the
> data is. Will
> someone have xylol or another cleaning agent? I can
> provide the
> sandpaper. :)
>
> Dan
>
> At 12:37 PM -0800 11/6/02, Roger Moore wrote:
> >I believe scrubbing with a Brillo pad would be in
> >order. Roger
> >
> >
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