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| Keywords: Agen1870-1871.jpg en View from the photographer's attic window Agen France circa 1875 An early natural-color photograph by Louis Ducos du Hauron Although he conceived patented and published several color photography processes during the 1860s du Hauron was unable to make much practical use of them until 1873-1874 when methods for adequately sensitizing photographic emulsions to green and red light were discovered http //www andinia com/a22005 shtml Louis Arthur Ducos du Hauron 1837 �1920 1874-1876 the earlier date range included in the file name is erroneous PD-old Louis Ducos du Hauron Color photographs from the 19th century | ||||
