Chromatic Biotechnology !
  The concept aims at using a microscopic mosaic of potato starch colored in
Orange, Green and Purple
placed between the medium and a photosensitive black & white layer.
During exposure, the medium facing the lens, the light goes through the medium and
then is filtered by the colored mosaic before insolating the black & white photosensitive layer.
After developing then inverting, the black & white layer allows the three-color mosaic to show through.
The AutoChrome is released by the light that goes through it.
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AutoChrome 9 x 12 © Collection Musée des Arts et Métiers - CNAM