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CGP EDU Academic Team
Published on: August 12, 2026
Why is AgBr used in photography ?
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Out of all silver halides, AgBr is most sensitive to light and under goes photo reduction to metallic silver instantaneously on exposure to light.
2AgBr ⎯→ 2Ag + Br 2
Unexposed AgBr can be dissolved out in hypo (Na 2 S 2 O 3 ) solution.
AgBr + 2Na 2 S 2 O 3 ⎯→ Na 3 [Ag(S 2 O 3 ) 2 ] + NaBr.
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