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472
JENNINGS, STANTON AND WEISS
November
SOUND TRACKS
Sound reproduction problems peculiar to multilayer color films with dye-image tracks have been the subject of several papers in the JOURNAL. Special techniques have had to be developed for dyeimage sound tracks, for it is now generally recognized that they cannot be used directly with the red-sensitive phototubes which are now standard for theater motion picture projectors.4 It is the universal characteristic of organic dyes suitable for three-color images that they are quite transparent in the near-infrared spectral region to which the 868 phototube has its greatest response. The result of trying to use such a combination inevitably is weak modulation and poor signal-tonoise ratio.
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Fig. 9. Schematic arrangement of processing machine.
Two solutions to this dilemma have been found. One is to use a magenta-dye sound track in conjunction with a phototube with an S-4 photosurface.5-6 The spectral response of such a phototube when illuminated with a tungsten lamp has its peak at about 530 m/*, which is near the maximum absorption of the magenta dye. Thus, variations in magenta density modulate the phototube strongly. A second solution is to convert the silver image formed in the sound track during development into silver sulfide, which is relatively nontransparent in the near infrared, hence can be used with standard redsensitive phototubes. Both of these methods can be utilized successfully with Du Pont Type 275 Color Film. The former has the advantage of simplicity, for it requires no extra treating steps; it also has certain technical superiorities. The latter has the advantage of expediency; it yields tracks which may be played with the present, existing phototubes.