Ambrotype

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Many ambrotypes were made by unknown photographers, such as this American example of a Union soldier with his family, circa 1863-65. Because of their fragility ambrotypes were held in folding cases much like those used for daguerreotypes

The ambrotype (from  — “immortal”, and  — “impression”) or amphitype is a photograph that creates a positive image on a sheet of glass using the wet plate collodion process. In the United States, ambrotypes first came into use in the early 1850s. The wet plate collodion process was invented just a few years before that by Frederick Scott Archer, but ambrotypes used the plate image as a positive, instead of a negative. In 1854, James Ambrose Cutting of Boston took out several patents relating to the process and may be responsible for coining the term "ambrotype".

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