: The plate was loaded into a camera with the glass side facing the lens so light passed through the starch filters before hitting the light-sensitive emulsion .
The was the world's first practical and commercially successful color photography process, patented in 1903 and marketed in 1907 by brothers Auguste and Louis Lumière . These glass plates (plaques) utilized a unique additive color method that used millions of microscopic grains of potato starch dyed red-orange, green, and blue-violet to filter light . How the Process Worked plaques autochromes lumiГЁre
: Approximately four million tiny grains of dyed potato starch per square inch were spread onto a glass plate . : The plate was loaded into a camera
: Fine black soot filled the tiny spaces between the starch grains to prevent unfiltered light from washing out the image . How the Process Worked : Approximately four million
The autochrome was a "mosaic screen plate" that combined science with a surprising organic ingredient .
: A special orange-yellow filter was required on the camera lens to correct the emulsion's natural over-sensitivity to blue light . Characteristics & Use Remembering Autochrome | Smithsonian Institution Archives