Introduced in the 1850s, the ambrotype is a positive photograph on glass made by a variant of the wet plate collodion process. Like a print on paper, it is viewed by reflected light.
Like the daguerreotype, which it replaced, and like the prints produced by a Polaroid camera, each is a unique original that could only be duplicated by using a camera to copy it.
During the 1860s, the ambrotype was superseded by the tintype, a similar photograph on thin black-lacquered iron, hard to distinguish from an ambrotype if under glass.
Here below is a set of amazing ambrotype photos from Powerhouse Museum that shows what people wore in the 1850s and 1860s.
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