A daguerreotype was an early type of photograph which was developed by Jacques Daguerre, in which the image was 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 was a negative image, but the mirrored surface of the metal plate reflects the image and makes it appear positive when the silvered surface had a dark ground reflected into it. Daguerreotype was a direct photographic process in which the photograph could not be reproduced and was therefore unique.
Edgar Allan Poe
Boulevard du Temple
The daguerreotype was the first publicly announced photographic process (1839) and while there were competing processes at the time, the accepted scientific etiquette of the time was that discovery was attributed to first published. All of the initial photographic processes required long periods for successful exposure and proved difficult for portraiture. The daguerreotype did become the first commercially viable photographic process in the history of photography as it was the first to permanently record and fix an image with exposure time compatible with portrait photography.
Daguerreotypes
Edgar Allan Poe
Boulevard du Temple
Daguerreotype
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