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Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 2, February 1942)
[ACTIVE]

Synthetic Aged Developers by Analysis

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
The dropping mercury electrode is applied to the problem of analyzing aged photographic developers and new tests are described for elon and hydroquinone. The question of suitable tests for bromide is discussed and it is shown that the bromide test must be independent of chloride. Such a test is described. Using these new technics and others it is demonstrated that it is possible and practical by chemical analysis alone to match exactly the photographic characteristics of an aged MQ developer. The only elements necessary for such an analysis are elon, hydroquinone, sulfite, salt concentration, pH, bromide, and iodide. The precision required for the proper analysis for each constituent has been investigated and is reported for three developer-film combinations. In general, the precision required is different for every combination. It is pointed out that the results show there are no unknowns in aged developers, that they differ from the original formulas only in concentrations and in the presence of iodide as well as bromide. Several useful consequences are suggested.
Publication Date
1942-02-01
DOI
10.5594/J09930
Link
https://doi.org/10.5594/J09930
Author(s)
R. M. Evans, W. T. Hanson, P. K. Glasoe
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R. M. Evans, W. T. Hanson, and P. K. Glasoe; Synthetic Aged Developers by Analysis, Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 2, February 1942); SMPTE, 1942. Available at https://doi.org/10.5594/J09930
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R. M. Evans, W. T. Hanson, and P. K. Glasoe; Synthetic Aged Developers by Analysis, Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 2, February 1942); SMPTE, 1942. Available at https://doi.org/10.5594/J09930

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R. M. Evans, W. T. Hanson, and P. K. Glasoe; Synthetic Aged Developers by Analysis, Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 2, February 1942); SMPTE, 1942. Available at https://doi.org/10.5594/J09930
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<span class="citation">R. M. Evans, W. T. Hanson, and P. K. Glasoe; <cite>Synthetic Aged Developers by Analysis</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 2, February 1942); SMPTE, 1942. Available at <a href="https://doi.org/10.5594/J09930" target="_blank" rel="noopener">https://doi.org/10.5594/J09930</a></span>

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R. M. Evans, W. T. Hanson, and P. K. Glasoe; Synthetic Aged Developers by Analysis, Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 2, February 1942); SMPTE, 1942
doi: 10.5594/J09930
url: https://doi.org/10.5594/J09930
Snippet:
<li>
R. M. Evans, W. T. Hanson, and P. K. Glasoe; <cite id="bib-10-5594-j09930">Synthetic Aged Developers by Analysis</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 2, February 1942); SMPTE, 1942
<span class="doi">10.5594/J09930</span>
</li>