[pure-silver] Ancient plates developing

Dear Sirs,
I am a new member of this list. I'm a Spanish photographer based in Barcelona.
I am intending to process some ancient plates exposed perhaps in the first 
years of 20th century. Those are stereoscopic plates which came in three 
magasins, together with a French camera made in the first years of that 
century. There is no information neither about the emulsion, neither about when 
they were exposed. I can only presume it is orthochromatic negative, which 
allows to process under red light. I can also presume this three magasins 
haven't been preserved in the best conditions.I would like to contact somebody 
familiar in this subject, who may help me in this process. Since I only have 
three plates, I can't do too many tests. 
I would really thank anybody to help me.

Ricard

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