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unusual facts about Collotype


The Fifty-Nine Icosahedra

Taf. is an abbreviation of Tafel, German for plate.


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Alphonse Poitevin

Alphonse 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.


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