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Forum: Film SLRs and Compact Film Cameras
03-25-2015, 03:52 PM
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It depends on the type of chemical reaction taking place but based on my knowledge of chemical stability in pharmaceutical product I use this rule of thumb:
The rate of reaction doubles for every increase of 10 degrees C, the reaction rate halves for every 10 degrees drop in temperature.
So: going from 25 C to 15 C the aging slows by a factor of 2.
Going from 25 C to 5 C the aging slows by a factor of 4.
Going from 25 C to -5 C the aging slows by a factor of 8.
Going from 25 C to -15 C the aging slows by a factor of 16.
This means that the deterioration occuring during 1 month in the closet equals the deterioration occuring during 16 months in the freezer.
Ignore this bit intended for geeks: Assuming zero order reaction kinetics.
A bit of background for the really interested:
Arrhenius equation - Wikipedia, the free encyclopedia
Regards,
Karet
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