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An autochrome is a color photograph on a glass plate. The process was patented by the Lumiere in 1906. It's one of the first viable color process. Here is a nice definition :
Autochrome plates were the invention of Auguste and Louis Lumiere, who patented the process in 1904 and began to market it commercially in 1907. Microscopic grains of potato starch were dyed red, green, and blue-violet, then mixed evenly and coated onto a sheet of glass. A black-and-white emulsion was then flowed over this layer. During exposure, the grains of potato starch on each plate acted as millions of tiny filters. The light-sensitive emulsion was then reversal processed into a positive transparency. When viewed, light passes through the emulsion and is filtered to the proper color by the starch grains. The resulting mosaic of glowing dots on glass gives autochromes the look of pointillist paintings. [ from http://www.photographymuseum.com/primer.html ]
Most of the autochromes are very dark (by nowadays standards) but they are really beautiful. The red is replaced by dark orange and blue by some sort of dark violet.
Most of the autochromes are of landscapes. They are only very few nude autochromes, and they are expensive. Autochromes can be "normal" or "stereo".