Auguste and Louis Lumière presented their autochrome invention to the French Academy of Sciences in 1904. The process uses a screen of minute potato starch grains dyed orange-red, green and violet. The dyed grains are dusted onto a glass plate, then covered with a layer of sensitive panchromatic silver bromide emulsion. As light enters the camera, it’s filtered by the dyed grains before it reaches the emulsion. Exposure time is very long, but once complete the plate can be processed using standard darkroom procedures. The result is an autochrome photograph.
Via George Eastman House
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