| Alberto,
I would bet there are places that would do a free analysis for you.
If I remember correctly, the Getty Conservation Institute would be a good place to check.
I think it was a person from the Getty's Conservation Institute that presented at APIS on analysis of vintage photographs.
They have a database of results that might help pinpoint the resinotype powder.
http://www.getty.edu/conservation/institute/
Best Wishes,
Mark Nelson
On Sep 7, 2008, at 4:02:53 PM, "Judy Seigel" <jseigel@panix.com> wrote: An Italian amateur collector has five
original small boxes of resinotypic powder, and he gave me a few grams
of these precious particles. But at present -I am a chemist without a
lab- I haven't found the opportunity to analize them. They might be
more complex than a simple colophony-stearine-pigment mixture, in
addition almost surely oxidized by the aging.
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