First color film that used a subtractive color method to be successfully mass-marketed. Launched 1935 for motion picture film, 1936 for still cameras. Special development process required, with multiple dyeing steps as each color layer was processed separately, because there were no dye-couplers in film, unlike the contemporary Agfa Color Neu (where color couplers enabled all three layers processed together). This resulted in good color longevity as developed Kodachrome does not retain unused color couplers. However it required more complex processing. Available in daylight (ISO 10) and Type A (ISO 16).