Nitrate base was an early flexible film support which was highly inflammable.
Nitric acid is used in emulsion manufacture, in toners, and in bleaches, it is highly corrosive.
Acetate base
Non inflammable base support for film emulsions which replaced the highly inflammable cellulose nitrate base.
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Kodak discontinued the manufacture of nitrate base in 1951, and the industry transitioned entirely to safety film in 1951 in the United States and by 1955 internationally.
 See also: Nitrate, Base, Emulsion, Film, Plate
  
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