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The ambrotype process is a photographic process that creates
a positive photographic image on a sheet of glass using the wet
plate collodion process patented in 1854 by James Ambrose
Cutting of Boston just a few years before that by Frederick
Scott Archer.
In Great Britain it was called collodion positive: one side of a
very clean glass plate is covered with a thin layer of
collodion, then dipped in a silver nitrate solution. The plate
is exposed to the subject while still wet. then developed and
fixed.
The ambrotype was much less expensive to produce than the
daguerreotype, and By the late 1850s, the
ambrotype was overtaking the daguerreotype in popularity; by the
mid-1860s, the ambrotype itself was supplanted by the tintype
and other processes.
Ambrotypes were often hand-tinted. Untinted ambrotypes are
grayish-white and have less contrast and brilliance than
daguerreotypes. Because of their fragility were held in folding cases
much like those used for daguerreotypes
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