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Oct., 1944
PROPERTIES AND BEHAVIOR OF FILM
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these data apply only to a particular case, and will vary with the type of film, the nature of the processing machine, and the drying conditions employed.
Motion picture film after processing should be neither overdried nor underdried. Film which is overdried may have too high a curl, and give a "spoky" roll when wound.12 Film which is insufficiently dried may be tacky, which (in the case of release prints) aggravates the various troubles characteristic of green film.13 Under certain conditions, moist film also has a greater tendency to go "in-and-out of focus" when projected.14
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6 8 10 20 30 40 60 TIME MINUTES
200 300
FIG. 8. The rate of conditioning of Eastman Nitrate Motion Picture Positive film from 78 per cent RH to 21 per cent RH at 70 F. Unknown low air velocity, probably under 1 ft per sec.
In the light of information available at the present time, it is generally recommended that motion picture film be dried in air having the relative humidity desired at equilibrium. It is preferable to dry negatives in air at about 60 per cent RH, because of the danger of producing static marks on the positive in printing if the negative is too dry. Positives, on the other hand, should be dried in air at about 40 per cent RH to minimize tackiness and reduce the tendency of the film to go "in-and-out of focus" when projected. In either case, sufficient time should be allowed to bring the base as well as the emulsion to approximate equilibrium with the drying air. In laboratories where it is impractical to have 2 different sets of drying conditions, a choice of about 50 per cent RH is probably the best