Gum Bichromate Photography Research Paper

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Carbon prints and gum bichromate prints are both examples of pigment processes. Alphonse Louis Poitevin was a French chemist, photographer who discovered the light–sensitive properties of dichromated gelatin and invented both the photolithography and calotype processes. Poitevin first one who discovered carbon printing then Joseph Swan improve it.

Walter woodbury, the Woodburytype this process invented in 1864. Woodburytype is not made by the light and it's not made by chemicals too, it's made in a mold a Woodburytype is a molded copy of an original photographic carbon print. The process was most commonly for illustrating fine books with photographic portraits and achieved acclaim for its exquisite rendering of pictorial detail and its permanency.
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