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Mold is the prime enemy of film materials, attacking the surface and emulsion. If film is unprocessed and in a moisture-proof container, it is usually safe from mold. However, when the package is broken, mold threads or filaments develop and immediately become apparent when the film is exposed. Film left in a camera in humid conditions is especially susceptible to mold. Coating microfilm during processing is regarded as a useful preventive measure, as this reduces the risk to the emulsion layer and allows the mold to be removed before serious damage occurs. One such coating is polysulfide, developed by the Image Permanence Institute of Rochester, New York (USA).
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