Search results
Deteriorated nitrate negatives are easy to identify, but nitrate negatives in good condition are almost visually indistinguishable from other types of transparent films. There are four ways to identify nitrate negatives.
Nitrate film is classified as "dangerous goods", which requires licenses for storage and transportation. Nitrate film stock was used in every major film production before about 1951. Many silent films only survived because they were printed to 16 mm film, which did not use a nitrate base.
3 lis 2011 · What is nitrate film? Cellulose nitrate was first used as a base for photographic roll film by George Eastman in 1889; it was used for photographic and professional 35mm motion picture film until the 1950s. It is highly flammable and also decomposes with age, becoming toxic.
This Technical Bulletin provides a comprehensive look at photographic negatives on plastic film bases made up of cellulose nitrate, cellulose acetate and polyester, and covers issues related to material composition, mechanisms of deterioration, access, handling and storage.
HISTORY OF FILM-BASED PHOTOGRAPHIC NEGATIVES. Eastman Kodak pioneered the first practical use of flexible, transparent film in 1889. This nitrate-based film had a strong tendency to curl and was extremely flammable. In 1903, this film was refined, incorporating a thicker nitrate film base and a gelatin coating on both sides.
Photographic negatives are made of an image-forming substance or emulsion, which is coated onto a base or support. The bases found in the Genthe collection are either glass, nitrate film (nitrocellulose), or safety film (cellulose acetate).
Cliché-verre is a photograph made from a hand-drawn negative. The design is either drawn or painted on to a sheet of glass, or, alternatively, scratched on to a piece of glass that has been made opaque by being painted over or blackened with smoke.
