Journal of the Society of Motion Picture Engineers ( Volume: 30, Issue: 5, May 1938)

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Reduction Potential and the Composition of an MQ Developer

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: After pointing out that photographic development is a reduction process, the terms “oxidation potential” and “reduction potential” are discussed. The methods of measuring such potentials are also discussed, as well as the condition that a system must be reversible before its true electrochemical potential can be measured. The reversibility of development in ferrous oxalate developers is referred to and some indication of reversibility in amidol developers is shown. The usual electrochemical methods of measuring potentials have been applied to organic developer solutions, and the effects of the various constituents of an MQ developer upon its “measured potential” are discussed. The true significance of these measured potentials is still not definitely known. It is shown that pH is the most important factor in determining the measured potential of a given developer solution, but that neither pH nor potential shows sufficient correlation with photographic action to be used as a “single” control variable.
Publication Date: 1938-05-01
DOI: 10.5594/J16579
Link: https://doi.org/10.5594/J16579
Author(s): R. M. Evans, W. T. Hanson

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R. M. Evans and W. T. Hanson; Reduction Potential and the Composition of an MQ Developer, Journal of the Society of Motion Picture Engineers ( Volume: 30, Issue: 5, May 1938); SMPTE, 1938. Available at https://doi.org/10.5594/J16579

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R. M. Evans and W. T. Hanson; Reduction Potential and the Composition of an MQ Developer, Journal of the Society of Motion Picture Engineers ( Volume: 30, Issue: 5, May 1938); SMPTE, 1938. Available at https://doi.org/10.5594/J16579

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<span class="citation">R. M. Evans and W. T. Hanson; <cite>Reduction Potential and the Composition of an MQ Developer</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 30, Issue: 5, May 1938); SMPTE, 1938. Available at <a href="https://doi.org/10.5594/J16579" target="_blank" rel="noopener">https://doi.org/10.5594/J16579</a></span>

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<li>
R. M. Evans and W. T. Hanson; <cite id="bib-10-5594-j16579">Reduction Potential and the Composition of an MQ Developer</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 30, Issue: 5, May 1938); SMPTE, 1938
<span class="doi">10.5594/J16579</span>
</li>