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Photographic emulsion is a light-sensitive colloid used in film-based photography. Most commonly, in silver-gelatin photography , it consists of silver halide crystals dispersed in gelatin . The emulsion is usually coated onto a substrate of glass , films (of cellulose nitrate , cellulose acetate or polyester ), paper, or fabric.
Eastman increased the length of rolls to 200 feet without major adjustments to the emulsion, retaining a large market share. Lumière reformulated its stock to match the speed of Eastman film, naming it 'Etiquette Violette' (Violet Label). Blair sold his English company to Pathé in 1907 and retired to the US. Pathé began to supplement its ...
The first flexible photographic roll film was sold by George Eastman in 1885, [45] but this original "film" was actually a coating on a paper base. As part of the processing, the image-bearing layer was stripped from the paper and attached to a sheet of hardened clear gelatin. The first transparent plastic roll film followed in 1889. [46]
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General purpose panchromatic film. High contrast mixed T/classic grain emulsion on a thin 80 μm polyester base. [208] Russia: 135-36 Silberra: U400: 2018-P: 400: B&W: Print: General purpose panchromatic film. igh contrast mixed T/classic grain emulsion on a thin 80 μm polyester base. [209] Russia: 135-36 Silberra: Cinema UN54 : 2018-T: 100: B ...
In some old processes, the film emulsion was hardened during the process, typically before the bleach. Such a hardening bath often used aldehydes, such as formaldehyde and glutaraldehyde. In modern processing, these hardening steps are unnecessary because the film emulsion is sufficiently hardened to withstand the processing chemicals.
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In 1931 KODAK released the film on a safety base as a Roll film, with greater latitude and finer grain than the KODAK NC (Non-Curling) Film that had been the standard since 1903. Replaced by Kodak Verichrome Pan (Panchromatic) film in 1956. US: 101, 103, 105, 116, 118, 120, 122, 124, 126 (roll film), 127, 130, 616, 620: Kodak Verichrome Pan: Kodak
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