Blanquart-Evrard, Louis-Désiré

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b. 2 August 1802 Lille, France
d. 28 April 1872 Lille, France
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French photographer, photographic innovator and entrepreneur.
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After beginning his working life in a tobacco company, Blanquart-Evrard became Laboratory Assistant to a chemist. He also became interested in painting on ivory and porcelain, foreshadowing a life-long interest in science and art. Following his marriage to the daughter of a textile merchant, Blanquart-Evrard became a partner in the family business in Lyon. During the 1840s he became interested in Talbot's calotype process and found that by applying gallic acid alone, as a developing agent after exposure, the exposure time could be shorter and the resulting image clearer. Blanquart-Evrard recognized that his process was well suited to producing positive prints in large numbers. During 1851 and 1852, in association with an artist friend, he became involved in producing quantities of prints for book illustrations. In 1849 he had announced a glass negative process similar to that devised two years earlier by Niepcc de St Victor. The carrying agent for silver salts was albumen, and more far-reaching was his albumen-coated printing-out paper announced in 1850. Albumen printing paper was widely adopted and the vast majority of photographs made in the nineteenth century were printed in this form. In 1870 Blanquart-Evrard began an association with the pioneer colour photographer Ducos du Hauron with a view to opening a three-colour printing establishment. Unfortunately plans were delayed by the Franco-Prussian War, and Blanquart-Evrard died in 1872 before the project could be brought to fruition.
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Bibliography
1851, Traité de photographie sur papier, Paris (provides details of his improvements to Talbot's process).
Further Reading
J.M.Eder, 1945, History of Photography, trans. E. Epstein, New York.
JW

Biographical history of technology. - Taylor & Francis e-Librar. . 2005.

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