Alphonse Louis Poitevin (Conflans-sur-Anille, 1819 – Conflans-sur-Anille, 1882) was a French chemist, photographer and civil engineer who discovered the light–sensitive properties of bichromated gelatin and invented both the photolithography and collotype processes.
He has been described as "one of the great unheralded figures in photography".[1] In the 1850s he discovered that gelatin in combination with either potassium or ammonium bichromate hardens in proportion to the amount of light that falls on it. This discovery, significant for its capacity to facilitate the mass production of photographs, was later used by numerous figures such as Josef Albert, Joseph Wilson Swan, Paul Pretsch and Charles Nègre to develop subsequent photographic printing processes such as heliogravure, photogravure, collotype, autotype and carbon print.[1]
^ abMartin Parr and Gerry Badger. The Photobook: A History, Volume I. p. 19.
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AlphonseLouisPoitevin (Conflans-sur-Anille, 1819 – Conflans-sur-Anille, 1882) was a French chemist, photographer and civil engineer who discovered the...
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mercury pump capable of producing a significant vacuum. August 27 – AlphonseLouisPoitevin patents the collotype photographic printing process in France....
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for Hugh. His Poitevin castles were confiscated, rearmed, and sold by Alphonse of Poitiers. He further humiliated himself by coming to Louis crying and kneeling...
black), was invented by AlphonsePoitevin in 1855. The process was later adapted to color, through the use of pigments, by Louis Ducos du Hauron in 1868...
online archive) (fr) Achille Luchaire, Louis VI le Gros, annales de sa vie et de son règne (1081-1137), Alphonse Picard, 1890, 395 pp. (fr) Roger Jouet...
division) Louis Thomas Gengoult (général de division) AlphonseLouis Gentil de Saint-Alphonse (général de division) Antoine Gentili (général de division)...
foreign soldier in the king's pay, he has been described as merely a "Poitevin mercenary captain". He returned several times to France on behalf of King...
arrived, Agnes and King Baldwin arranged for Sibylla to be married to a Poitevin newcomer, Guy of Lusignan, whose older brother Amalric of Lusignan was...
and Gilles de Rais hoped to recover the inheritance of all Beatrice's Poitevin castles at a later date. However, Béatrice de Montjean remarried Jacques...
Joseph and Antoine Limonaire and Giacomo Gavioli. Collotype process by AlphonsePoitevin in 1856. Beaux-Arts architecture: a 19th century architectural style...
the Fenolheda), and internal allophone enclaves (Petite Gavacharie of Poitevin-Saintongeais language, ancient Ligurian enclaves of eastern Provence, the...
treaties signed with Louis IX. In 1241 he joined the coalition being formed by Hugh X of Lusignan against Louis IX and his brother, Alphonse, count of Poitou...
Jean-Charles Plantevin René Pleven Roger Podeur Raymond Pognon Jean Poirel René Poitevin Pierre Poletti Jean Pompei Dominique Ponchardier Pierre Ponchardier Edmond...
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