Plaques Autochromes Lumiгёre -

: Fine black soot filled the tiny spaces between the starch grains to prevent unfiltered light from washing out the image .

: 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 plaques autochromes lumiГЁre

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 : Fine black soot filled the tiny spaces

: 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 . These glass plates (plaques) utilized a unique additive

: Approximately four million tiny grains of dyed potato starch per square inch were spread onto a glass plate .