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Photochrome refers to a photograph in color. Historically, early attempts at color photography involved hand-tinting black and white images. A process called photochromy, used in the past, involved a silver chloride emulsion layer that took on the color of the light exposing it.123

In 1907, the Autochrome process became the first practical color photography method, producing color transparencies. Later, in 1935, Kodachrome film revolutionized color photography, allowing for reproducible color transparencies. The Agfacolor negative-positive process followed, and by 1942, Kodak introduced Kodacolor negative-positive film, which became popular for amateur photography.4

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