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Louis Ducos Du Hauron French
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Ducos du Hauron, an amateur physicist and artist, began experimenting with color photography in the early 1860s. By 1868 he had patented a three-color process that he improved upon and published the following year in the treatise Les Couleurs en photographie: solution du problème. His method involved exposing negatives through green, orange-red, and blue-violet filters and then making positives of them on three sheets of gelatin incorporating carbon pigments of primary colors. When superimposed, the three layers made a single color photograph: a technique that is essentially the basis of modern color processes.
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