Louis-Jacques-Mandé Daguerre was born on November 18, 1787 and died on July 10, 1851 (at the age of 63). He was a French chemist and artist, known for his invention of the daguerreotype process of photography. Daguerre improved upon the photography process first created by Joseph Niepce and Johann Schultz. Daguerreotype photography involves exposing copper-silver plates to iodide, obtaining silver iodide. You then expose them to light for several minutes, coating the plate with 75° Celsius mercury vapor (to combine the mercury with the silver), and finish the image in salt water. This process produces an exact reproduction of the scene, but must be protected from fingerprints in a glass box. Daguerreotype photographs were typically portraits, and the subjects had to remain completely still as the process took several minutes. Due to their long exposure time, daguerreotypes could not capture any moving objects. The first photograph taken of a person was Daguerre’s 1838 photo, “Boulevard du Temple.” Daguerreotype photography was later replaced by the less time-consuming and complex processes of ambrotype and tintype.
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