Magic lantern slides dating of
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This negative on glass is underexposed and treated with a chemical solution that results in a silver image with a whitish tone rather than a brown tone.
Dates of major use: 1850-1950 Inventor: Christian Huygens (1629-1695), Langenheim Bros (1850) A lantern slide is a transparency of a positive photograph on glass.
A sheet of paper is coated with a mix of bichromated gelatin and pigment.
It is then exposed to light in contact with a negative. Areas exposed to light are hardened and become insoluble, while, in areas that have not been exposed, the gelatin and the pigments dissolve in the water.
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Dates of major use: 1840-1865 Inventor: Louis Jacques Mandé Daguerre (1839) A daguerreotype is an image formed on a copper plate coated with a thin layer of silver, which can appear to be a positive or a negative depending on the angle it is viewed. Because the silver-coated plates of daguerreotypes were extremely fragile, they were always protected under glass.