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
early 20th century. Those are stereoscopic plates which were 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