Kodacolor-X is a color negative film that was manufactured by Eastman Kodak between 1963 and 1974. It was introduced along with the Kodak Instamatic cameras which use 126 film.
The film was designed to be processed in the C-22 process, which is the predecessor to today’s C-41 process.
Only a few specialty labs still process this film, due to the length of discontinuation. Surviving exposed (but unprocessed) Kodacolor-X and C-22 films can still yield images, although this requires highly specialized development techniques. The Darkroom will process Kodacolor-X and C-22 as black and white since the color chemicals and equipment are no longer available.
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Source: https://en.wikipedia.org/wiki/Kodacolor_(still_photography)