Which of the following chemicals is not used in photographic processing?

Silver halide

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Ammonium thiosulphate

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Copper nitrate

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Both (A) and (B)

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Solution

The correct option is A Copper nitrate
Silver halide is the most important chemical used in photographic processing. It is the key component of the emulsion. Ammonium thiosulfate is used as a chemical in the final step of the photographic processing of film on paper. Thus, the chemical copper nitrate as a chemical is not used in photographic processing.

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