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462
JENNINGS, STANTON AND WEISS
November
with blue light. The yellow dye that is present and which distributes itself throughout the film absorbs the blue light as it passes through and prevents it from exposing the bottom layers which, since they contain silver halides, are also blue-sensitive. The yellow dye dissolves out during processing.
2. The separator layers prevent interlay er effects, not those usually caused by migration of the coupler molecules, since in this film these have been immobilized by making them an integral part of the binder, but those caused by migration of oxidized developer molecules between adjacent layers.
3. The middle emulsion layer, sensitized only to red light in addition to its inherent blue sensitivity, receives the cyan image from the red analysis record by printing with red light.
LAYER
RECORD
SENSITIVITY
BLUE
RED
GREEN
NOT TO SCALE
* ALSO CONTAINS YELLOW DYE
Fig. 1. Structure of Du Pont Type 275 Color Film, Release Positive.
MAGENTA -FORMING EMULSION *
GREEN RED BLUE
SEPARATOR
CYAN-FORMING EMULSION
SEPARATOR
YELLOW-FORMING EMULSION
SUBSTRATUM
SUPPORT
SUBSTRATUM
ANTIHALATION BACKING
4. The bottom emulsion layer, sensitized only to green light as well as retaining its inherent blue sensitivity, receives the yellow image from the blue analysis record by printing with green light.
5. The substratum layers anchor the emulsion and backing layers to the film base.
6. The antihalation backing coated on the rear of the film absorbs any light passing through the emulsions into the base, so that it cannot be reflected from the back surface of the film and cause halation. During development the backing dye is decolorized, and later on, during the washing steps, the entire backing layer dissolves off spontaneously without mechanical scrubbing. The spectral absorption of the backing is shown in Fig. 2, there being ample density at all wavelengths where protection from halation is required.
It is to be noted here that the layers other than the emulsion layers