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Description: | Early Heliograph on pewter (photo-etched pewter plate), 'Le Cardinal d'Amboise', Joseph Nic�phore Ni�pce, 1826. Given by Ni�pce to Franz Andreas Bauer, in 1827. �Le Cardinal d�Amboise� is one of the earliest photomechanical plates in existence and was taken from the original engraving �Georges Cardinal d�Amboise, Grand Ministre d�Estat et L�gat en France� by Isaac Briot (1585-1670). Ni�pce made the first photograph on a pewter plate in 1826 or 1827. He named his process Heliography. The Heliographic process used Bitumen of Judea, here on pewter, which hardens when exposed to light. To create a negative, an engraving was varnished, placed over the plate and exposed to sunlight. The soluble unexposed bitumen was dissolved in an oil of lavender-kerosene mixture and the plate was etched in an acid bath. The exposed hardened bitumen acted as a resist, so that the acid etched only areas of unexposed metal. The resulting heliographic plate was used to make final prints on paper. | License: | http://creativecommons.org/licenses/by-nc-sa/2.5/ | Subjects: | photomechanical plate heliograph | Temporal: | 1826 | Source: | Science Museum | Creator: | Ni�pce, Joseph Nic�phore (1765-1833) | Identifier: | 2003-5001/2/22332 | Go to resource |
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