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Chemical in New Color Film Corrects Light Absorption
In an address before the American Chemical Society in Rochester, N. Y.,
Dr. Cyril J. Staud, director of the Kodak Research Laboratory, announced a new color film containing colored couplers which give automatic correction of undesired light absorption.
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Speaking on some aspects of chemistry in color photography, Dr. Staud described a "coupler" as being a chemical which combines with other chemicals, producing a dye. Special types of such couplers will be incorporated in each of the lightsensitive layers in the new film, to be known as "Ektacolor."
Explaining the principle of correction, Dr. Staud stated that in the past, undesired light absorption was corrected by the formation of silver positive images which were exposed in register with the color negative. By the new chemical process, azo dyes giving proper absorption can be attached to couplers, and are eliminated during the coupling reaction.
"The result of this reaction," he continued, "is to destroy the inherent color of the coupler in the process. After color development, there are present in the emulsion layer a negative image of the coupler dye and a positive image of the remaining unreacted coupler."
He explained that this colored image serves to compensate for the unwanted absorption of the image dye and brings about automatic color correction.
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INTERNATIONAL PROJECTIONIST • December 1947