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The
daguerreotype was the earliest practical photographic process, and was especially
suited to portraiture.
It was
made by exposing the image on a sensitized silver-plated sheet of copper,
and as a result, the surface of a daguerreotype is highly reflective.
There
is no negative used in this process, and the image is almost always reversed
left to right. Sometimes a mirror inside the camera was used to correct
this reversal.
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