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Silver bromide (not bromine) is one of the silver compounds used to create the "emulsion" that records the latent image before it is developed. It is the most widely used of the silver salts, which are compounds that react to light and create the latent image.

Bromine (not silver bromine) is released when the developer acts on the silver halides if the emulsion is silver bromide based. I'm not sure if that is the result of a chemical reaction between the silver halide and film developer, or if the bromine atoms are already present due to the reaction between light and the silver halide. I only mention this because bromine is in your question although I think you meant bromide. The bromine can be utilized to reduce image contrast in high contrast scenes, but I believe it is not widely known how to develop film in this manner, hence you probably weren't asking for the usefulness of bromine.

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