Utocolor

Utocolor or Uto paper was a light-sensitive paper for color photography manufactured by Dr. J.H. Smith of Zurich, Switzerland and available by early 1907.[1]

  1. ^ Czapek, C.W., "Experiments with the Bleach-Out Printing Process", British Journal of Photography, Colour Photography Supplement, April 5, 1907, pp. 28-29.