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Sept., 1930] STORAGE OF MOTION PICTURE FILM 303
exposed motion picture film, and placed in ordinary tin plate cans. The tin plate or other rust resistant metal container is satisfactory provided it is inspected frequently so as to permit replacement before the film and its wrappings become contaminated with the products of corrosion.
The moisture content of the film to be stored should preferably be such that it is in equilibrium with an atmosphere of 70 per cent relative humidity at 75°F. before storing. Under these conditions no serious trouble will be encountered as a result of condensation of drops of moisture from the air in the can when the temperature is reduced to 45°F. If, for any reason, film must be cleaned before storing, only liquids which do not attack the film should be used.9
EXAMINATION OF FILM AT INTERVALS
Before exposing a roll of the cooled film to room conditions it should be warmed to a temperature above the dew point of the atmosphere so that moisture will not condense upon it when it is rewound. Moisture condensed on the film as dew would otherwise cause sticking of the film convolutions. A suitable warming cabinet maintained at a temperature of 75°F. to 80°F. and containing dry air should be located conveniently near the film vault.
It is desirable to inspect all film by rewinding at least once every two years and if any signs of deterioration are visible a duplicate should be made.
METHOD OF KEEPING RECORDS
It is assumed that all film placed in the vault for storage is sufficiently valuable to merit considerable care in accounting for it. The following procedure for keeping records has been adopted by the Eastman Kodak Company.
Each cabinet drawer is numbered and the film accounted for by such drawer numbers. On receipt of the film the custodian makes out a storage ticket in quadruplicate. The first copy is filed in the head office which is remote from the vault; the second is filed in a safe within the vault; the third is given to the individual depositing the film; and the fourth is placed in the can of film. At the same time, a record is made in a bound book for reference in case of loss of the ticket records.
In order to withdraw film from the vault a duly authorized person whose signature is on file with the custodian signs the withdrawal