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23-Aug-2017 03:24

In the wet process, a collodion emulsion containing suspended silver halide crystals had to be formed on the plate just before it was exposed in the camera while still wet.Chemical treatment then reduced the crystals to microscopic particles of metallic silver in proportion to the intensity and duration of their exposure to light, resulting in a visible image.The tintype's immediate predecessor, the ambrotype, was done by the same process of using a sheet of glass as the support.The glass was either of a dark color or provided with a black backing so that, as with a tintype, the underexposed negative image in the emulsion appeared as a positive.Such collodion glass positives had been invented by Frederick Scott Archer in 1851 and the name Ambrotype was introduced in the United States by James Ambrose Cutting in 1854 when he patented a variation of Archer's original process.The tintype was essentially a variant of the ambrotype, replacing the latter's glass plate with a thin sheet of japanned iron (hence ferro).

It began losing artistic and commercial ground to higher quality albumen prints on paper in the mid-1860s, yet survived for well over another 40 years, living mostly as a carnival novelty.To obtain as light-toned an image as possible, potassium cyanide, a very dangerous and powerful deadly poison, was normally employed as the photographic fixer.It was perhaps the most acutely hazardous of all the several highly toxic chemicals originally used in this and many other early photographic processes.It was first called melainotype, then ferrotype by a rival manufacturer of the iron plates used, then finally tintype.

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The ambrotype was the first use of the wet-plate collodion process as a positive image.

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