Originally, all photography was monochrome, or black-and-white. Even after color film. Originally, all photography was monochrome.

Although cellulose acetate or “safety film” had been introduced by Kodak in 1908,[24] at first it found only a few special applications as an alternative to the hazardous nitrate film, which had the advantages of being considerably tougher, slightly more transparent, and cheaper. The changeover was not completed for X-ray films until 1933, and although safety film was always used for 16 Although cellulose acetate or “safety film” had been introduced by Kodak in 1908,[24] at first it found only a few special applications as an alternative to the hazardous nitrate film, which had the advantages of being considerably tougher, slightly more transparent, and cheaper. The changeover was not completed for X-ray films until 1933.

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