page_title: Daguerreotype
section_title: Unusual characteristics
hierarchical_section_title: Daguerreotype / Unusual characteristics
caption_attribution_description: Portrait of a Daguerreotypist Displaying Daguerreotypes and Cases
context_page_description: The daguerreotype process, or daguerreotypy, was the first publicly available photographic process, widely used during the 1840s and 1850s.
  Invented by Louis-Jacques-Mandé Daguerre and introduced worldwide in 1839, the daguerreotype was almost completely superseded by 1860 with new, less expensive processes yielding more readily viewable images. There was a revival of daguerreotypy in the late 20th century by a small number of photographers interested in making artistic use of early photographic processes.
  To make the image, a daguerrotypist would polish a sheet of silver-plated copper to a mirror finish, treat it with fumes that made its surface light sensitive, expose it in a camera for as long as was judged to be necessary, which could be as little as a few seconds for brightly sunlit subjects or much longer with less intense lighting; make the resulting latent image on it visible by fuming it with mercury vapor; remove its sensitivity to light by liquid chemical treatment, rinse and dry it, then seal the easily marred result behind glass in a protective enclosure.
context_section_description: Daguerreotypes are normally laterally reversed—mirror images—because they are necessarily viewed from the side that originally faced the camera lens. Although a daguerreotypist could attach a mirror or reflective prism in front of the lens to obtain a right-reading result, in practice this was rarely done.
  The use of either type of attachment caused some light loss, somewhat increasing the required exposure time, and unless they were of very high optical quality they could degrade the quality of the image. Right-reading text or right-handed buttons on men's clothing in a daguerreotype may only be evidence that it is a copy of a typical wrong-reading original.
  The experience of viewing a daguerreotype is unlike that of viewing any other type of photograph. The image does not sit on the surface of the plate, after flipping from positive to negative as the viewing angle is adjusted, viewers experience an apparition in space, a mirage that arises once the eyes are properly focused. Of course when reproduced via other processes, this effect associated with viewing an original daguerreotype will no longer be apparent. Other processes that have a similar viewing experience are holograms on credit cards or Lippmann plates.
  Although daguerreotypes are unique images, they could be copied by re-daguerreotyping the original. Copies were also produced by lithography or engraving. Today, they can be digitally scanned.
  A well-exposed and sharp large-format daguerreotype is able to faithfully record fine detail at a resolution that today's digital cameras are not able to match.
caption: Portrait of a Daguerreotypist Displaying Daguerreotypes and Cases pictured in an airtight frame.
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