Silver bromide ($\mathrm{AgBr}$)

Silver bromide is $\mathrm{AgBr}$, a photosensitive silver halide used in photographic emulsions. The behaviour depends on the crystal grain and its defects as well as on the chemical formula.

Exposure creates a latent image that can be amplified during chemical development. Unexposed silver bromide can then be removed through complex formation with thiosulfate, illustrating how photochemistry and coordination chemistry cooperate in one imaging process.