Introduced by Kodak in the 1956, C-22 is an obsolete process for developing color film, superseded by the C-41 process in 1972 for the launch of 110 film and in 1974 for all other formats. The development of the film material is carried out at temperatures of around 75°F (24°C), making the process incompatible with the more modern C-41 process, which uses a temperature of 100°F (38°C). C-22 uses Color Developing Agent 3, unlike C-41 which uses Color Developing Agent 4. The most common film requiring this process is Kodacolor-X. C-22 film can still (as of 2020) be developed in black and white. References Photographic film processes