XRF?

On Sat, Mar 21, 2015 at 1:16 PM, Susan Walter <[log in to unmask]> wrote:

> Years ago I plunked a ring into a machine that analyzed its chemistry.
> There were expensive models and those you could take into the field.  I
> remember it as “Xchrom” but that’s not coming up in my feeble internet
> searching strategies.   Can someone help me please?  What is that thing
> called?
>



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