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476 C. J. KUNZ AND C. E. IVES Vol 46, No. 6
On occasion, these measures may also be applied in conditioning processed film; for instance, dehumidification may be used to retard fungus growth or to eliminate stickiness which would prevent motion picture film from traveling smoothly through the projector. The use of desiccants with processed motion picture film is not generally advisable however, because of the danger of embrittling the film if desiccation is carried too far. Effective and safer procedures are known but consideration of them is outside the scope of the present paper. Humidification, on the other hand, may be required to overcome a tendency toward brittleness resulting from storage under extremely dry conditions. While the same general principles as set forth here for the case of undeveloped film apply to developed film, the situation will differ quantitatively with the latter.
Condition of Film. — For the present purpose it will be sufficient to consider that raw film as supplied by the manufacturer has, in general, a moisture content which permits it to withstand, for reasonable periods before and after exposure, temperatures around 70 F and middle-range humidities without serious loss of speed or deterioration in image quality. It will be assumed here that the absorption of additional moisture is a contributing factor in deterioration, especially if the film is to be kept at high temperature for any considerable time previous to development.
Climatic Conditions. — Available information indicates that film may encounter temperatures from —80 F to +140 F, and relative humidities from a few per cent to practically 100 per cent. The high humidities are not ordinarily met at temperatures above 100 F. In this paper attention is centered on the control of film moisture content and temperature is considered only incidentally.
Problem of Moisture Control. — To the extent that facilities permit, recommendations as to temperature can be followed successfully by using a thermometer and by exercising ordinary care and good judgment. In contrast, there is no such simple instrument by the use of which the moisture content of film, desiccants, etc., can readily be determined. Estimates of the amount of moisture taken up by film and desiccants, as well as of the influence of a number of factors on the rate of moisture transfer, may have to be made in the field with reasonable accuracy but without the aid of any instruments. Because of the lack of information, -opportunities for shielding the film from unfavorable treatment may be overlooked and measures adopted for desiccation may be unsuitable. Indeed, it now appears