Journal of the Society of Motion Picture Engineers ( Volume: 31, Issue: 1, July 1938)

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The Influence of pH on Washing Films after Processing

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: Advantages stated to be obtained by adjusting fixing baths and wash-water to the isoelectric point of gelatin have been claimed. The advantages are said to be shorter washing time, less swelling and retention of water, with consequent improvement in the jelly strength of the wet emulsion, and reduced drying time. In the present investigation the conditions as to pH of the solutions, and wash-water, rate of flow of water, residual thiosulfate, etc., were controlled accurately. The results indicate that with a regular acid fixing and hardening bath (F-25) there is no advantage, but rather a disadvantage in washing at the isoelectric point (ca. pH 4.9) rather than at pH 7 to 8, since the time required to remove hypo to the same degree is increased, nor is less water retained. In a non-hardening acid fixing bath, there was little difference in washing time, but some gain in drying time for the isoelectric wash because of reduced water absorption.
Publication Date: 1938-07-01
DOI: 10.5594/J14655
Link: https://doi.org/10.5594/J14655
Author(s): S. E. Sheppard, R. C. Houck

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S. E. Sheppard and R. C. Houck; The Influence of pH on Washing Films after Processing, Journal of the Society of Motion Picture Engineers ( Volume: 31, Issue: 1, July 1938); SMPTE, 1938. Available at https://doi.org/10.5594/J14655

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S. E. Sheppard and R. C. Houck; The Influence of pH on Washing Films after Processing, Journal of the Society of Motion Picture Engineers ( Volume: 31, Issue: 1, July 1938); SMPTE, 1938. Available at https://doi.org/10.5594/J14655

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<span class="citation">S. E. Sheppard and R. C. Houck; <cite>The Influence of pH on Washing Films after Processing</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 31, Issue: 1, July 1938); SMPTE, 1938. Available at <a href="https://doi.org/10.5594/J14655" target="_blank" rel="noopener">https://doi.org/10.5594/J14655</a></span>

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<li>
S. E. Sheppard and R. C. Houck; <cite id="bib-10-5594-j14655">The Influence of pH on Washing Films after Processing</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 31, Issue: 1, July 1938); SMPTE, 1938
<span class="doi">10.5594/J14655</span>
</li>