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362 XI. PRESERVATION AND STORAGE
Storage Recommendations
It is advisable to follow the recommendations of film manufacturers closely. For Kodachrome, it is first necessary to clean the film lightly yet thoroughly; carbon tetrachloride (Carbona) applied sparingly is probably the best cleaning agent. After cleaning, the film should be wound firmly and smoothly on a core without cinching, and placed in an ordinary metal film can. Cleaning and packing is best done in a dustfree air-conditioned room where the temperature is near 65° or 70°F. and the relative humidity near 40%.
The film cans are identified and then sealed ; an adhesive tape is good for the purpose, since it will seal the can quite thoroughly. A suggested sealing would be two turns of "Scotch tape" on the underside and two turns of Kodatape or similar adhesive over the "Scotch tape." It is preferable to use film cans that do not have any holes; should holes be present, it is necessary to seal them so that no moisture exchange may occur between the outside atmosphere and the atmosphere within the can. The more thorough the seal, the slower the deterioration of the Kodachrome under the conditions specified. After sealing, the cans are placed in an electric refrigerator or other cooled space where the temperature can be maintained at 45° to 50°F. ; the temperature should be as nearly constant as possible.
For the sound track original more elaborate precautions may need to be employed ; this depends upon how well the original was developed. Fortunately, the shrinkage and loss of flexibility with age of Eastman 5372 are not very serious if the film is kept well sealed. The major deterioration to be avoided is image deterioration which is aggravated by excess residual hypo that results from insufficient and improper washing of the film after developing and fixing. Another result of "cheap developing" to be avoided is improper drying. The most obvious cure for this kind of situation is to have the film properly developed, washed, and dried when it is first developed in the laboratory.
The sound film should first be permitted to become moisture-stabilized with the surrounding atmosphere of 65° or 70° F. and 40% relative humidity. Film that is loosely wound and left in an unsealed can will become moisture-stabilized in about 24 hours. When ready, the film should be identified, and sealed* in the manner similar to that used for Kodachrome.
* These instructions do not apply to nitrate-base films. Under no circumstances should nitrate base films be sealed, since the by-products of nitrate film deterioration are toxic and explosive.