wet collodion process

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also called  Collodion Process,  

      early photographic technique invented by Frederick Scott Archer (Archer, Frederick Scott) of England in 1851. To a solution of collodion (cellulose nitrate) Archer added a soluble iodide and coated a glass plate with the mixture. In the darkroom the plate was immersed in a solution of silver nitrate to form silver iodide. The plate, still wet, was exposed in the camera. It was then developed by pouring over it a solution of pyrogallic acid (pyrogallol) and was fixed with a strong solution of sodium thiosulfate, for which potassium cyanide was later substituted. Immediate developing and fixing were necessary because, after the collodion film had dried, it became waterproof and the reagent solutions could not penetrate it. A modification of the process, in which an underexposed negative was backed with black paper or velvet to form what was called an ambrotype, became very popular—as did also a version on black lacquered metal known as a tintype, or ferrotype.

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Universalium. 2010.

Look at other dictionaries:

  • wet collodion process — wet plate process, early photographic process in which a glass plate coated with an iodized collodion is dipped into a silver nitrate solution before use …   English contemporary dictionary

  • wet collodion process — Photog. See wet plate process …   Useful english dictionary

  • Wet (collodion) process — Мокроколлодионный процесс …   Краткий толковый словарь по полиграфии

  • wet plate process — wet collodion process, early photographic process in which a glass plate coated with an iodized collodion is dipped into a silver nitrate solution before use …   English contemporary dictionary

  • wet plate process — a photographic process, in common use in the mid 19th century, employing a glass photographic plate coated with iodized collodion and dipped in a silver nitrate solution immediately before use. Also called wet collodion process, collodion process …   Universalium

  • wet plate process — a photographic process, in common use in the mid 19th century, employing a glass photographic plate coated with iodized collodion and dipped in a silver nitrate solution immediately before use. Also called wet collodion process, collodion process …   Useful english dictionary

  • wet-plate process — ˈ ̷ ̷| ̷ ̷ noun : an early collodion process …   Useful english dictionary

  • Collodion process — An old deteriorated wet plate featuring Theodore Roosevelt The collodion process is an early photographic process. It was introduced in the 1850s and by the end of that decade it had almost entirely replaced the first practical photographic… …   Wikipedia

  • collodion process — noun : a photographic process in which collodion is used as a vehicle for sensitive salts; specifically : an early process in which the negative is prepared by coating a glass plate with collodion containing iodide, exposing in a camera while wet …   Useful english dictionary

  • collodion process — Photog. See wet plate process. [1865 60] * * * …   Universalium

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