Name the solution used to wash photograp...

Name the solution used to wash photographic films. Give chemical reaction involved in the above process.

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Sodium thiosulphate `(Na_(2)S_(2)O_(3))` is used to wash photographic films.
`AgBr+2Na_(2)S_(2)O_(3)rarr Na_(3)[Ag(S_(2)O_(3))_(2)]+NaBr`

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