Alphonse Louis Poitevin 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... Wikipedia
Born: August 29, 1819, Conflans-sur-Anille, France
Died: 1882 (age 63 years), Conflans-sur-Anille, France
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