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Collodion

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collodion (kəlō`dēən), solution of pyroxylin pyroxylin , partially nitrated cellulose (see nitrocellulose). It is used in lacquers, plastics, and artificial leathers. Pyroxylin lacquers are made by dissolving pyroxylin in a mixture of volatile solvents and adding a plasticizer and a pigment or dye.
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 in a mixture of alcohol and ether. Upon exposure to air, the solvents evaporate, leaving a thin, colorless, elastic film on any surface upon which the collodion has been spread. Collodion is the forerunner of the lacquer paints that are now widely used in the automobile industry.
collodion [kə′lōd·ē·ən]
(organic chemistry)
Cellulose nitrate deposited from a solution of 60% ether and 40% alcohol, used for making fibers and film and in membranes for dialysis.

Collodion 

an alcoholether solution of nitrocellulose; a colorless, transparent, or slightly yellowish liquid with the odor of ether. When applied to the skin, collodion congeals, forming a thin, tough film. It is used to secure surgical bandages and to coat small wounds and abrasions.



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The wet-plate collodion process can be employed to create negatives for making multiple, albumen-paper prints, but the process can also result in an "ambrotype," an antique image medium that Gerlach adores.
Eventually the collodion method of taking photographs was developed bringing the cost of having a photo taken down significantly and allowing more people to take and collect pictures from their lives.
The exhibit starts with Watkins, who made four trips to the gorge in the mid to late 19th century, carrying a large-format camera and a set of collodion wet-plate glass negatives that were in use at the time.
 
 
 
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