Archived posting to the Leica Users Group, 2005/06/03
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Thanks for a great, quantified answer, Don. I asked, because I have a vague recollection of Doug Herr mentioning that he had frozen caches of Kodachrome, preserved for many years. Forgive me, Doug, if my memory is faulty. Julian ----- Original Message ----- From: "Don Dory" <dorysrus@mindspring.com> To: "'Leica Users Group'" <lug@leica-users.org> Sent: Friday, June 03, 2005 11:11 PM Subject: [Leica] Fridge or freezer > Julian, > Freezing film will dramatically increase the shelf life of normal speed > film. It will have less use for high speed films as they respond to gamma > rays to a greater extent than say a 100 ISO film. > > An old rule of thumb from biology and organic chemistry is that reactions > increase/decrease 100%/50% for each 10 degrees C change. If we assume 20 > degrees C as normal then keeping film at 0 will quadruple the life of the > film give or take. > > Probably true rumors are that NASA kept film stocks in liquid nitrogen once > an emulsion was thoroughly vetted so that you could buy a whole run, know > exactly how it would react, and keep it for a long time. > > Don > dorysrus@mindspring.com > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >