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Ambrotype: the “glass Daguerreotype”
Period
of Use: 1851 - 1880s
The
ambrotype is a variation of the wet collodion process, and was cheaper
than the daguerreotype. The ambrotype was made by slightly underexposing
a glass wet plate in the camera. The finished plate produced a negative
image that appeared positive when backed with velvet, paper, metal or
varnish, making it the 19th century equivalent of the "instant photograph".
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