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Write the balanced chemical equation for developing photographic films.

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The light sensitised photographic film is treated with hydroquinone which is a very mild reducing agent. It does not affect the unexoposed silver bromide.

Unexposed AgBr is dissolved in `Na_(2)S_(2)O_(3)` (hypo) to give sodium argentohiosulphate.
`AgBr+2Na_(2)S_(2)O_(3)rarr Na_(3)[Ag(S_(2)O_(3))_(2)]+NaBr`
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