You can see a detailed explanation of film storage here. You can find other storage recommendations in the specific product technical datasheets and also in the publicationH-2 Cinematographer's Field Guide ( 629 KB, 50 pp.)
In general, Kodak recommends the following storage at a relative humidity (RH) of 50%:
High humidity can promote mold growth and ferrotyping, and lower humidity can create static marks when printing or buckling due to uneven moisture loss. Refrigerating camera films reduces the photographic effects of storage, but refrigeration cannot reduce the effects of ambient gamma radiation. Gamma radiation (high energy from cosmic radiation and low energy from radio-nucleotide decay) increases the D-min densities and toe densities and also increases grain. Higher speed films are more affected by gamma radiation than lower speed films. A camera film with an EI (Exposure Index) of 800 has a three times greater change than an EI 200 film. Exposed and unprocessed film that has been properly refrigerated retains the speed and contrast of the exposure conditions, but the overall D-min, toe and grain will continue to increase. For more information, visit Film Storage Information.
Kodak Step Wedge Film for KODAK WRATTEN Photographic filters, and other quality control and calibration devices can be ordered directly from Kodak.
Kodak and Wratten are trademarks of Eastman Kodak Company.
Frequently Asked Questions provide information of limited or specific application. Responsibility for judging the applicability of the information for a specific use rests with the end user.