Replenishment of Solutions In Batch Processing

Paper presented at a Symposium on “Photographic Materials and Processes in the Printing Industry”, organized by the Scientific and Technical Group on 4–6 December 1963, in London.

Abstract

The advantages of replenished batch processing are on the one hand the safer handling of the film in deep tanks. as compared to tray processing. and on the other hand the certainty of constant photographic results over long periods. specially desirable in the graphic arts field for colour separation negatives and positives. So as to ensure constancy of the replenished solution, a part of it must be discarded after each processing run. and the volume levelled up with replenisher. A simple equation is presented which allows the handling of all factors acting on the equilibrium composition of the replenished sol tion. and on the replenisher formula and replenishing rate. Praceical rules for handling replenished batch processes. deduced theoretically as well as by experiment, are also presented.

Notes

Paper presented at a Symposium on “Photographic Materials and Processes in the Printing Industry”, organized by the Scientific and Technical Group on 4–6 December 1963, in London.