Abstract
The degradation of safety cellulose ester base photographic film is evidenced by the release of acetic acid or other organic acids, thus the name “vinegar syndrome. ” Deterioration is also accompanied by a decrease in pH, tensile properties of the base, and wet strength of the emulsion. The acid increase can be measured by leaching the acid in 38°C water, followed by titration with sodium hydroxide. A similar procedure has been developed for use with cellulose nitrate film. The water-leaching titration method is more sensitive than pH or physical properties measurements, but suffers from the disadvantages that it requires laboratory skills and is destructive of the film. A nondestructive field test using an acid-base indicator paper has been developed.
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