Wikipedia
Woodburytype
[[Image:Nāser al-Dīn Schah.jpg|thumb|right|
Nāser al-Dīn Shah - Shah of Persia - Carte de visite Woodburytype-Print from Felix Nadar Paris]]
The term Woodburytype refers to both a photomechanical process and the print produced by this process. The process produces continuous tone images in slight relief. A chromated gelatin film is exposed under a photographic negative, which hardens in proportion to the amount of light. Then it is developed in hot water to remove all the unexposed gelatin and dried. This relief is pressed into a sheet of lead in a press with 5000 psi. This is an intaglio plate. It is used as a mold and is filled with pigmented gelatin. The gelatin layer is then pressed onto a paper support.