The chemical used as a fixer/developer in photography is _________.
Sodium sulphate
Sodium sulphide
Sodium thiosulphate
Sodium sulphite
A
Sodium thiosulphate
B
Sodium sulphite
C
Sodium sulphate
D
Sodium sulphide
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Solution
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Photographic fixer is a mix of chemicals used in the final step in the photographic processing of film or paper. By fixation, the film or paper is insensitive to further action by light. Popular salts are sodium thiosulfate and ammonium thiosulfate.
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