Quote:
Originally Posted by Joe_G.
Do you know how much it costs to analyze a card and is it destructive in any way?
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In regards to this question, the answer is no. You just need a XRF (X-Ray flourescence) analyzer and/or a ATR-FTIR spectrometer, among other tools and methods. I think you can probably rent one somewhere for several hundred dollars per day/week.
You might enjoy this article from the Getty Museum. It goes into a lot of detail:
https://www.getty.edu/conservation/p...as_albumen.pdf.
And this one too.
https://www.getty.edu/conservation/p..._saltprint.pdf