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Kodachrome is a brand of color transparency (slide) film sold by Kodak. Kodachrome was invented by Leopold Godowsky, Jr. and Leopold Mannes. It was first sold as 16 mm movie film in 1935, and as 8 mm movie film and 135 film in 1936. Kodachrome is the oldest successfully mass-marketed color still film using a subtractive method). Kodachrome has been through many incarnations and undergone four major developing process changes over the years; the current is the K-14 process.