Kodak paper dating guide

New technologies are adopted based on their advantages, and disadvantages are considered later or sometimes not at all.

Preservation often involves working to mitigate those disadvantages and, in the case of photography, this means working to increase the stability of inherently unstable materials.

Real photo postcards are arguably the most interesting postcards, especially when they recorda specific event.

But even collotypes will exhibit a discernible grain when magnified.There are three broad types of film-based photographic materials: cellulose nitrate, cellulose acetates, and polyester.These materials have been used as a support for negatives, positive transparencies, motion pictures, microfilm, and other photographic products.Unfortunately, cellulose nitrate and cellulose acetates are unstable.The products of their degradation can severely harm and even destroy photographic collections, in addition to posing serious safety hazards.

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