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Autochrome

The autochrome plate was the first three-color photography process on the market and belongs to the group of additive color processes. The medium consists of a mosaic of colors on a glass plate, designed to be viewed using hand-held devices or projected using carbon arc lamps.

The plates were patented in 1904 by the Lumière brothers, produced and marketed starting in 1907 by the Lumière company, and a popular success until Kodachrome was released in the early 1930s. Production stopped in 1932, although the process was still used on flexible film sheets until 1955.

In this process, a glass plate coated with a latex-based varnish is covered with a thin, regular layer of grains of potato starch dyed green, blue, and red-orange.

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