Hello,
I have been student with the late Jean Pierre Sudre and his wife Claudine (1of the best specialists in Europe for 19th century processes) in the mid 80's.
I don't know if what you call crystalline images refer to what Jean Pierre called his Cristallisations : very large format colour-toned abstract photographs obtained by enlarging 5x7 film on which JP had smashed heated crystals  of various photographic chemicals.
As far as I remember his first cristallisations had been realized using Potassium Bromide; he also used sodium sulfite and experimented a lot...
I have a text he wrote about this work. When I get some time in the next days, I'll look at what he said and I'll post you the details !
Hope it helps you
Jean
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De : 	dean kansky[SMTP:dkansky@hotmail.com]
Date d'envoi :	dimanche 19 décembre 1999 10:51
A :	alt-photo-process-l@sask.usask.ca
Objet :	Jean-Pierre Sudre Crystalline images
Are Sundre's crystalline images just made with dryed fixer, or are there 
other additives?
What kind fixer can be used: Standard silver fixer or non-acidic fixer used 
with Alt-photography? Or it does not matter?
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