Ambrotype: 1850s-invented-photograph that creates a positive image on a sheet of glass using the wet plate collodion process, invented a few years earlier by Frederick Scott Archer.
Tintype: Photograph made by creating a direct positive on a thin sheet of iron coated with a dark lacquer or enamel and used as the support for the photographic emulsion during the 1860s and '70s.
Heliography: Photographic process invented by Joseph Nicéphore Niépce around 1822, using Bitumen of Judea, a naturally occurring asphalt, as a coating on glass or metal. It hardened in proportion to its exposure to light. When the plate was washed with oil of lavender, only the hardened areas remained. (kind of like mehndi)
Daguerreotype: Image formed on a silvered metal plate - or brass or copper - which was exposed to halogen fumes such as iodine, bromine, and chlorine in subdued light and transported to a camera via a light-tight plate holder.
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