Ambrotype
Mid 19th century photographic process introduced in 1851 52 by Frederick Scott Archer and Peter Fry. It used weak collodion negatives which were bleached and backed by a black background which produced the effect of a positive image.
Ambrotype
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The ambrotype process was patented in 1854 and enjoyed great popularity for a few short years, and again during the Civil War. It produced pictures on glass instead of metal plates.
1855-57: Direct positive images on glass (ambrotypes) and metal (tintypes or ferrotypes) popular in the US.
There are many examples from over one hundred years ago using daguerreotypes, ambrotypes, tintypes, and paper images.
Reproduction A copy of a fine art piece, such as a digital print reproduction of a painting or of a photograph created in a different media such as an ambrotype or platinum print..
 See also: Photograph, Image, Photography, Negative, Print
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