Jet Antihalation Backing and Its Removal from Films during Processing

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: Removable jet-black backing, commonly referred to as rem jet, is coated on the support side of many color films to absorb any light that is not absorbed by the emulsion and support layers during the photographic exposure. Without rem jet, some light would be reflected at the support-air interface. This reflected light could expose additional silver halide in the emulsion, giving rise to halation. The backing also provides antistatic protection, some lubricity and some protection from scratches. Rem jet is a dispersion of carbon black in a polymeric binder, a dibasic half ester of cellulose acetate. On passing through solubilizing solutions at pH values above 8, the polymer becomes soluble in water and this property is utilized to remove the rem jet in processing. Also important is the suppression of solubility by a high concentration of salts. Backing removal includes submerging the film in an alkaline solution of high salt content, rinsing with water, and buffing away the remaining rem jet. Chemicals and water with few impurities must be used, and rem jet must be removed carefully and completely at the proper point in the process. A particular rem-jet-removal system that is in general use is discussed in detail because it has many necessary and desirable general characteristics. Several other proven rem-jet-removal systems are discussed briefly. A new approach to rem-jet-removal equipment is also discussed.
Publication Date: 1971-07-01
DOI: 10.5594/J00826
Link: https://doi.org/10.5594/J00826
Author(s): Charleton C. Bard, James E. Dunn

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Charleton C. Bard and James E. Dunn; Jet Antihalation Backing and Its Removal from Films during Processing, Journal of the SMPTE ( Volume: 80, Issue: 7, July 1971); SMPTE, 1971. Available at https://doi.org/10.5594/J00826

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Charleton C. Bard and James E. Dunn; Jet Antihalation Backing and Its Removal from Films during Processing, Journal of the SMPTE ( Volume: 80, Issue: 7, July 1971); SMPTE, 1971. Available at https://doi.org/10.5594/J00826

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<span class="citation">Charleton C. Bard and James E. Dunn; <cite>Jet Antihalation Backing and Its Removal from Films during Processing</cite>, Journal of the SMPTE ( Volume: 80, Issue: 7, July 1971); SMPTE, 1971. Available at <a href="https://doi.org/10.5594/J00826" target="_blank" rel="noopener">https://doi.org/10.5594/J00826</a></span>

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Charleton C. Bard and James E. Dunn; Jet Antihalation Backing and Its Removal from Films during Processing, Journal of the SMPTE ( Volume: 80, Issue: 7, July 1971); SMPTE, 1971
doi: 10.5594/J00826
url: https://doi.org/10.5594/J00826

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<li>
Charleton C. Bard and James E. Dunn; <cite id="bib-10-5594-j00826">Jet Antihalation Backing and Its Removal from Films during Processing</cite>, Journal of the SMPTE ( Volume: 80, Issue: 7, July 1971); SMPTE, 1971
<span class="doi">10.5594/J00826</span>
</li>