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/Vnalysis of Developers and Bleach for Ansco Color Film*
BY A. H. BRUNNER, JR., P. B. MEANS, JR., AND R. H. ZAPPERT
ANSCO, BlNGHAMTON, NEW YORK
Summary — Published procedures for black-and-white developer analysis are reviewed. New analytical methods are described or old ones modified to achieve the accuracy required for the complete control of all constituents of the developers used for Ansco color film. To evaluate the bleach solution prior to regeneration, a procedure is presented for the determination of ferrocyanide ion in this solution.
INTRODUCTION
IT HAS BEEN RECOGNIZED for some time that the accurate analysis of black-and-white developing solutions is especially important in the control of continuously replenished developers. As shown by Bates and Runyan,1 it is of even greater importance in color-processing developers because proper color balance must be maintained among three different emulsions. In the past few years, several articles have appeared in the technical literature concerning the analysis of blackand-white photographic developers, but nothing has been published on the analysis of developers used for processing color film because, until recently, color film was processed only by the manufacturer.
Little has appeared in the literature concerning the control of photographic bleach solutions but when this solution is to be regenerated, as described by Bates and Runyan,1 a method for its analysis is necessary.
The procedures here described are, for the most part, adaptations of methods previously reported for use with the usual black-and-white developers. They have been selected for their brevity, simplicity, and accuracy and have been used for the control of continuously replenished solutions for some time by unskilled technicians and require no special equipment other than a potentiometer.
DISCUSSION
The procedures discussed here have been adapted especially for use with the Ansco developers listed in Table I but may be used for other developers with some modification.
* Presented May 18, 1948, at the SMPE Convention in Santa Monica.
JULY, 1949 JOURNAL OF THE SMPE VOLUME 53 25