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Deteriorated nitrate negatives are easy to identify, but nitrate negatives in good condition are almost visually indistinguishable from other types of transparent films. There are four ways to identify nitrate negatives.
16 sty 2018 · Nitrate negatives usually deteriorate in just a few decades, making them an extremely unstable storage medium. As they deteriorate, the image begins to fade and the negative turns soft and gooey, causing it to weld itself to whatever it’s stored with, resulting in the loss of the image.
This Technical Bulletin provides a comprehensive look at photographic negatives on plastic film bases made up of cellulose nitrate, cellulose acetate and polyester, and covers issues related to material composition, mechanisms of deterioration, access, handling and storage.
Tips for determining whether a film negative is cellulose nitrate, including by examining the notch codes and the film type wording on the edges of the negative and using this chart to see if it is safety film or nitrate film.
Nitrate refers to a group of early transparent plastic film supports that were most common between 1910 and 1950. Created as an easy-to-handle replacement for heavy and awkward glass plates, gelatin film, and paper negatives, nitrate film was used for still photographic negatives and transparencies, as well as motion picture film.
Recent research indicates that all cellulose-based film, whether it's a cellulose nitrate negative from the 1890's or a cellulose triacetate color transparency from the 1990's, share very similar deterioration mechanisms that are temperature and humidity dependent.
1 maj 2023 · The stability of the support (film base) is one of the most significant factors for long-term preservation of any film including photographic negatives, microforms, and motion picture film. Storage in cold temperatures (35°F or lower) is very important in preserving cellulose nitrate and cellulose acetate films regardless of format.
