Ion-Exchange Recovery of Eastman Color Developers

It is customary to use continuous replenishment in a motion-picture processing machine to maintain a constant chemical composition in each of the processing solutions. This necessitates the mixing of large volumes of replenisher, and the continuous overflow of solution from each machine tank. As the overflow solution is discarded, expensive chemicals are lost. Since developer chemicals constitute a large portion of processing costs, a method of recovering or reusing the developer overflow would result in reduced costs. This paper describes a method of decreasing replenishment costs for Eastman Color Print and Eastman Color Negative developers by recovering overflow developer using an ion-exchange method.

Print ISSN

0361-4573

Published

1956-09

Content type

Original Research

DOI

10.5594/J11289