Wikipedia - "The daguerreotype ... (French: daguerréotype) was the first commercially successful photographic process, invented around 1837 by Louis-Jacques-Mandé Daguerre. The physical daguerreotype itself is a direct positive made in the camera on a silvered copper plate. The raw material for plates was called Sheffield plate, plating by fusion or cold-rolled cladding and was a standard hardware item produced by heating and rolling silver foil in contact with a copper support. The surface of a daguerreotype is like a mirror, with the image made directly on the silvered surface; it is very fragile and can be rubbed off with a finger, and the finished plate has to be angled so as to reflect some dark surface in order to view the image properly."
Wikipedia
YouTube: The Daguerreotype: Photographic Processes, Daguerreotypes at the Met
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