Dating bases guide

Identification is crucial because storage, duplication, rehousing, and treatment decisions are based on accurate identification.Film-base materials can be damaged easily, even when in good condition.Many manufacturers and suppliers of housing materials now conduct this test on their products.If at all possible, purchase products that have passed the PAT or specify that any housing purchased must pass the PAT.There are three broad types of film-base photographic materials: cellulose nitrate, the cellulose acetates, and polyester.These materials have been used as a support for negatives, positive transparencies, motion pictures, microfilm, and other photographic products.The deterioration of cellulose acetate is auto-catalytic, like that of cellulose nitrate; once deterioration has begun the degradation products induce further deterioration.

When handling or examining materials establish a system for setting aside or locating damaged materials.Do not allow eating, drinking, or smoking in the processing/examination area.Prolonged exposure to deteriorated negatives can be dangerous, especially when in large collections.Furthermore, deteriorated materials may become sticky and adhere to other materials.When handling film-base materials, wear clean cotton gloves and work in a clean, well-lit, and well-ventilated area with enough room for processing.

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