Source: Coe, Brian (1981): The History of Movie Photography. Westfield, N.J.: Eastview Editions.
"Du Hauron invented his Chromographoscope in 1874. It could be used either as a camera or an additive viewer." Source: Coote, Jack H. (1993): The Illustrated History of Colour Photography. Surbiton, Surrey: Fountain Press.
An early three-color print by Louis Ducros Du Hauron, 1877.