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This ability to employ underexposed images allowed shorter exposure times to be used, a great advantage in portraiture.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.The tintype saw the Civil War come and go, documenting the individual soldier and horrific battle scenes.It captured scenes from the Wild West, as it was easy to produce by itinerant photographers working out of covered wagons.In both processes, a very underexposed negative image was produced in the emulsion.Its densest areas, corresponding to the lightest parts of the subject, appeared gray by reflected light.It was perhaps the most acutely hazardous of all the several highly toxic chemicals originally used in this and many other early photographic processes.One unusual piece of tintype equipment was a twelve-lensed camera that could make a dozen Each tintype is usually a camera original, so the image is usually a mirror image, reversed left to right from reality.

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.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 later and more convenient dry process was similar but used a gelatin emulsion which could be applied to the plate long before use and exposed in the camera dry.A tintype, also known as a melainotype or ferrotype, is a photograph made by creating a direct positive on a thin sheet of metal coated with a dark lacquer or enamel and used as the support for the photographic emulsion.Tintypes enjoyed their widest use during the 1860s and 1870s, but lesser use of the medium persisted into the early 20th century and it has been revived as a novelty in the 21st.

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