daguerreotype

n. first practical photographic method in which pictures were made on plates of glass or metal (names after its inventor, Louis Daguerre); picture made using the daguerrotype technique (also daguerrotype)

The daguerreotype is an early type of photograph, developed by Louis Daguerre, in which the image is exposed directly onto a mirror-polished surface of silver bearing a coating of silver halide particles deposited by iodine vapor. In later developments bromine and chlorine vapors were also used, resulting in shorter exposure times. The daguerreotype is a negative image, but the mirrored surface of the metal plate reflects the image and makes it appear positive in the proper light. Thus, daguerreotypy is a direct photographic process without the capacity for duplication.
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Noun
1. a photograph made by an early photographic process; the image was produced on a silver plate sensitized to iodine and developed in mercury vapor
(hypernym) photograph, photo, exposure, pic

n. daguerreotype, early photographic method

n. daguerreotype, early photographic method