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Redox Reactions- Photography
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How photography works
-photo film in made of grains of silver bromide (AgBr) in a gel spread very thinly
-when light enters the camera it activates the silver bromide grains
-this causes some bromide ions to be reduced and some silver ions to be oxidized
-at this point you'd have to take the film into a dark room to create the image
Continued
-a chemical will be used to reduce all the silver activated silver ions so that it will stop developing the image, but will not effect the unactivated ions.
-the remaining silver bromide must be removed to prevent the film from darkening
-to do this the ions must be made into a water soluble complex
-most often sodium thiosulfate is used for this
-the film is then washed to remove developing chemicals and the soluble ions
-a negative image is the result
-a positive image is produced by a similar series of reactions after light is shown through the negative onto light sensitive photographic paper
References
http://www.augustatech.edu/chemistry/blackand.htm
https://prezi.com/adjab-hawewo/photography-redox/
http://www.joelsartore.com/about-joel/common-questions/how-can-photography-help-the-environment/
Reactions
-there's roughly 3 reactions that take place in this process
1: Image formation;