The Allowable Temperature and Relative Humidity Range for ...

Journal of the Society of Archivists, Vol. 17, No. 1, 1996. CONSERVATION FORUM. The Allowable Temperature and Relative Humidity Range for the Safe Use and Storage of Photographic Materials MARK H. McCORMICK-GOODHART, Smithsonian Institution, Washington, DC. Introduction Conventional photographic materials typically make use of a gelatin binder in one or more coating layers. Although the final image may be formed by silver particles, organic dyes, or other inorganic components, gelatin has been the material of choice for more than a century to serve as the image binder. Additional gelatin layers are also frequently present. They function, for example, as anti-curl layers or overcoat layers which improve abrasion resistance andlor alter surface texture. T h e gelatin layers are adhered to a common support layer, and substrates made of acetate, polyester, glass, paper, or polyethylene resin coated paper have found widespread usage. T h e physical structure of the majority of twentieth century photographic films and prints can be understood by considering combinations of these basic material components.

Journal of the Society of Archivists, Vol. 17, No. 1, 1996 CONSERVATION FORUM The Allowable Temperature and Relative Humidity Range for the Safe Use and

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