Journal of the Society of Motion Picture Engineers ( Volume: 42, Issue: 5, May 1944)

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A Simplified Variable-Density Sound Negative Developer

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: A variable-density sound negative developer composed of Metol, borax, and sulfite is described. That such a sound negative developer is possible, is shown by a preliminary survey of the literature pertaining to hydroquinone-Metol activity at low pH values. In a developer so constituted and coupled with an adequate replenisher system, the oxidation factor is practically negligible and results in a stable pH value which in turn permits the elimination of the usual buffering agents. The value of such a developer is that it permits greater simplicity of chemical control and results in some economy. Sensitometric data obtained from the operation of this developer show a negative H and D characteristic of maximum linear latitude, and normal printing characteristics. Gamma-density relationship is very stable during continuous negative developing runs, thus making possible quantity production of sound negatives of uniform density.
Publication Date: 1944-05-01
DOI: 10.5594/J08447
Link: https://doi.org/10.5594/J08447
Author(s): Paul Zeff, S. J. Twining

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Paul Zeff and S. J. Twining; A Simplified Variable-Density Sound Negative Developer, Journal of the Society of Motion Picture Engineers ( Volume: 42, Issue: 5, May 1944); SMPTE, 1944. Available at https://doi.org/10.5594/J08447

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Paul Zeff and S. J. Twining; A Simplified Variable-Density Sound Negative Developer, Journal of the Society of Motion Picture Engineers ( Volume: 42, Issue: 5, May 1944); SMPTE, 1944. Available at https://doi.org/10.5594/J08447

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<span class="citation">Paul Zeff and S. J. Twining; <cite>A Simplified Variable-Density Sound Negative Developer</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 42, Issue: 5, May 1944); SMPTE, 1944. Available at <a href="https://doi.org/10.5594/J08447" target="_blank" rel="noopener">https://doi.org/10.5594/J08447</a></span>

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<li>
Paul Zeff and S. J. Twining; <cite id="bib-10-5594-j08447">A Simplified Variable-Density Sound Negative Developer</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 42, Issue: 5, May 1944); SMPTE, 1944
<span class="doi">10.5594/J08447</span>
</li>