What are the relative advantages and disadvantages of using paper enclosures to protect photographic materials?
Paper enclosures are opaque, protecting the photograph from light. However, this makes viewing difficult; since the photograph must be removed from the enclosure before it can be viewed. This increases handling and subsequent abrasion and fingerprinting of the image. Paper enclosures are porous, protecting the photograph from the accumulation of moisture and detrimental gases. This is especially important for cellulose nitrate and early safety film negatives, since the gases generated by the deterioration of these support materials are harmful to photographic materials. Paper enclosures are available in buffered and non-buffered stock; both should be of archival quality and non-acidic. Buffered storage enclosures are not recommended for colour images, cyanotypes, or albumen prints. They are recommended for cellulose nitrate and early safety film negatives, brittle prints and prints on brittle acidic mounts. Paper enclosures should not be made of Kraft or glassine paper as the impuritie
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