Ambrotype
Variant of the wet plate collodion process / From Wikipedia, the free encyclopedia
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The ambrotype, also known as a collodion positive in the UK, 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.
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The ambrotype was introduced in the 1850s. During the 1860s it was superseded by the tintype, a similar photograph on thin black-lacquered iron, hard to distinguish from an ambrotype if under glass.
The term ambrotype comes from Ancient Greek: ἄμβροτος ambrotos, "immortal", and τύπος typos, "impression".