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Processing Control Procedures for Ansco Color Film*
BY J. E. BATES AND I. V. RUNYAN
ANSCO, BlNGHAMTON, NEW YORK
Summary — Reproducible processing of Ansco color film requires continuous control of the solution compositions. Early experience showed that frequent change of processing solutions was necessary to maintain consistency. New replenisher formulas are described which together with sensitometric controls and occasional chemical analysis have proved successful for maintaining the processing solutions in a satisfactory condition indefinitely. Color-balance differences resulting from varied types of agitation, depending on the processing equipment, may be adjusted by changing the chemical constitution of the first developer.
THE CONTINUOUS processing of Ansco color film requires control of speed, gradation, fog, D-max., and other variables common to the processing of black-and-white films, but with the complicating factor that these variables must be kept constant in each of three superimposed emulsion layers.
When this color film was first introduced, frequent changes of processing solutions were advised to prevent the deteriorating effects of aging and exhaustion. With experience, methods of processing control gradually have evolved using continuous replenishing procedures controlled by sensitometric and analytical tests. This paper presents an outline of the essential control steps necessary at each operating stage of a processing laboratory. Through the use of these practices an experienced control man can maintain a set of processing solutions indefinitely. Tests are outlined not only for actual machine operations but also to check raw chemicals and individual mixes of solutions. Although essentially designed for motion picture laboratories, the basic methods are also applicable to roll and sheet-film processing units, and with different developer replenishers, to the processing of Printon.
I. BASIC CONTROL METHODS
Three general control methods, photographic, analytical and pH, are recommended for the various testing operations. The necessary
* Presented May 18, 1948, at the SMPE Convention in Santa Monica.
JULY, 1949 JOURNAL OF THE SMPE VOLUME 53 3