Journal of the Society of Motion Picture and Television Engineers (1950-1954)

picture film may develop excessive curl and brittleness. The best conditions of storage are those where the film can be kept under controlled conditions of temperature and humidity. A relative humidity of 40 to 50% and a temperature of 70 F or less are most satisfactory for storage. Where it is not possible to furnish controlled humidity conditions, the film should be kept in a taped can, care being taken to have the equilibrium humidity of the film below 60% before the can is taped. The best insurance, however, is to prepare black-and-white separation positives in the manner described in a later section of this paper. III. Eastman Color Print Safety Film, Type 5382 (35mm) and 7382 (16mm) General Description The new release print material is known as Eastman Color Print Safety Film, Type 5382 (35mm) and 7382 (16mm). This material is an integraltripack. incorporated-coupler type film. Prints can be prepared on this film directly from a color negative made on Eastman Color Negative Film, Type 5248, or from Eastman Color Internegative Film, Type 5245. It may also be used for making prints from three-color separation negatives obtained in various ways. This film is composed essentially of three emulsions sensitized to blue, green and red light and coated on one side of a single safety film support. The emulsions contain, in addition to the silver halide salts, appropriate dye couplers dispersed within them. On exposure and processing, a silver image and a dye image are produced in each layer, according to the exposure which each layer has received. The silver is later removed, leaving only the dye images as the final result in the picture area. The sound-track area, however, is redeveloped to give both a silver and a dye image in the track. The structure of Eastman Color Print Film is shown diagrammatically in Plate III. The top layer is a gelatin overcoating to minimize the effects of abrasion during the handling of the film. The second layer consists of a greensensitive emulsion in which is dispersed an uncolored coupler, which, during development, produces a magenta dye image. A gelatin interlayer separates the two top emulsion layers. The fourth layer consists of a red-sensitive emulsion containing a colorless coupler dispersed within it, which, during development, produces a cyan dye image. The fifth layer is a gelatin interlayer. The bottom layer is a blue-sensitive emulsion containing a colorless coupler which, during development, produces a yellow dye. All three emulsion layers are initially tinted purplish-blue in order to reduce light scatter and to improve sharpness. This color disappears during processing. On the side of the support opposite the emulsion layers is a removable jet antihalation backing. Characteristics Type 5382 Film is supplied in lengths of 1000 ft and is perforated according to the American Standard PH22.1-1953.* The 16mm film is supplied in lengths of 1,200 ft, perforated according to Proposed American Standards PH22.5 and PH22.12.f Eastman Color Print Film is colorbalanced to allow printing to be done by tungsten-quality illumination having a * Dimensions for 35mm Motion-Picture Film, Alternate Standards for Either Positive or Negative Raw Stock, PH22.1-1953, Jour. SMPTE, 60: 67-68, Jan. 1953. f Dimensions for 16mm Single-Perforated Motion Picture Film, PH22.12, and Dimensions for 16mm Double-Perforated Motion Picture Film, PH22.5, Jour. SMPTE, 59: 527, Dec. 1952. Hanson and Kisner: Improved Color Films 681