Copper and Sulfide in Developers

The formation of excessive fog by a developer containing copper or sulfide is well known. However, no quantitative method for determining the concentration of either copper or sulfide in a developer appears to have been published. In this paper, polarographic methods of analysis for these substances are given together with photographic determinations of the effect of concentration on fog, thus demonstrating that the analyses are capable of determining the minimum amount of copper or sulfide required to cause fog under the conditions used. — The fogging action of a developer which has accumulated sulfide by bacterial action is shown to be the same as that produced by a fresh developer containing the equivalent quantity of sodium sulfide.

Print ISSN

0097-5834

Published

1943-02

Content type

Original Research

DOI

10.5594/J14277