Mustafa maybe your sister can get some Lumiere Alticolor or Filmcolor, have you tried to contact Frederic Mocellin mocellin_fr@yahoo.fr or Ronan Guinée the later is from the Albert Kahn Collection http://albert-kahn.hauts-de-seine.ne...iques/contact/

Since Autochrome plates are sandwiched between two glass sheet the original plate + a protective plate it's very hard to see wether a plate is varnished or not. Maybe your sister can find a box with undeveloped plates at a marchee au puce, there is a big one specialised in antiquities. http://marcheauxpuces-saintouen.com/1.aspx

Good Luck

Dominik