The fixing solution used in developing a negative in photography contains:
Correct answer: B. Sodium thiosulphate
- A. Hydroquinone
- B. Sodium thiosulphate
- C. Pyfogallal
- D. AgBr
Explanation
Sodium thiosulfate (sodium hyposulfite), Na2S2O3, is used by photographers to fix developed negatives and prints; it acts by dissolving the part of the silver salts coated onto film which remain unchanged by exposure to light. Fixation is commonly achieved by treating the film or paper with a solution of thiosulfate salt. Popular salts are sodium thiosulfate-commonly called hypo-and ammonium thiosulfate-commonly used in modern rapid fixer formulae.
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