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Should photographic material be stored in neutral or alkaline materials?

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Most photographs can be safely stored in alkaline materials with the exception of cyanotypes (blueprints), color photographs, and diazo process. However, if you cannot determine or are uncertain of the type of photographic process used, opt for storage materials that have a neutral pH as well as passing the P.A.T. (Photographic Activity Test, ANSI/NAPM Standard IT.9.16 1993).  more
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