Climate Controlled Storage

The preservation of photographs, and all documents and artworks, depends on the storage environment and the storage enclosures. Many institutions have climate controlled storage rooms with purified air, kept at constant moderate or cool temperatures (e.g., 65-70F) and moderate relative humidities (e.g., 35-50%). Some institutions even have cold vaults for certain types of photographs that are very prone to deterioration, such as color photographs and older films. Unfortunately, these conditions are not easily found or maintained in homes! However, there are things you can do to improve the storage climate for your valuable photographs in your home: store your photographs in the coolest and driest spot in your home that stays that way year round. Finished basements frequently are cool, but they are usually too damp for photo storage unless they are dehumidified. Dampness should be avoided as it causes photos to stick together, and promotes mold growth. Above ground interior closets maintain fairly constant temperatures throughout the year, and should be considered for storage.
All plastic and paper materials used to house and store valuable and heirloom photographs should pass the ANSI IT9.16 Photographic Activity Test (PAT). (The PAT was developed by the American National Standards Institute (ANSI) and is a test that determines whether or not a storage material will cause fading or staining in photographs.) In addition, other storage materials such as envelopes, folders, sleeves, and boxes should meet the standards described in ANSI IT9.2 Photographic Processed Films, Plates, and Papers--Filing Enclosures and Storage Containers. Many manufacturers make storage materials which meet these two standards and advertise them in their catalogs.

Look for paper enclosures that are made from a high quality, non-acidic, lignin-free paper (buffered or unbuffered are OK) made from cotton or highly purified wood pulps. Paper envelopes with center seams should be avoided--if the seam adhesive causes fading or staining it will happen in the middle of your photograph. If you do use an envelope with a center seam, place the back side of the photo against the seam--any deterioration would have to work its way through the back before attacking the image on the front.

Credits

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