(a) Photographic film and prints. The requirements in this paragraph apply to permanent, long-term temporary, and unscheduled audiovisual records.

(1) General guidance. Keep all film in cold storage following guidance by the International Organization for Standardization in ISO 18911 (incorporated by reference, see §1237.3). See also ISO 18920 (incorporated by reference, see §1237.3).

(2) Color images and acetate-based media. Keep in an area maintained below 40 degrees Fahrenheit with 20-40% relative humidity to retard the fading of color images and the deterioration of acetate-based media.

(b) Digital images on magnetic tape. For digital images stored on magnetic tape, keep in an area maintained at a constant temperature range of 62 degrees Fahrenheit to 68 degrees Fahrenheit, with constant relative humidity from 35% to 45%. See also the recommendations in ISO 18923 (incorporated by reference, see §1237.3); and the requirements for electronic records storage in 36 CFR 1236.28.

(c) Digital images on optical media. For permanent, long-term temporary, or unscheduled digital images maintained on optical media (e.g., CDs, DVDs), use the recommended storage temperature and humidity levels stated in ISO 18925 (incorporated by reference, see §1237.3).