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Why was silver bromide important in traditional photographic film?

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A color-coded periodic table of the elements displays each element's symbol and atomic number, with categories such as alkali metals, noble gases, halogens, transition metals, and actinoid elements distinguished by different background colors. — halogen Modern version of the periodic table of the elements.

Silver bromide is essential in traditional photography because it is a silver halide compound that is extremely sensitive to light. In photographic film, these crystals are suspended in a gelatin emulsion to form the light-sensitive surface.12

When light enters a camera and strikes these crystals, it triggers a chemical reaction that creates a latent image. Specifically, light releases electrons that migrate to sensitivity specks within the crystal, attracting silver ions to form metallic silver. This process makes the exposed crystals susceptible to being reduced to metallic silver by developing agents, which allows the image to be made visible.2

Because of their high efficiency in converting light into permanent images, silver halides remain the primary material used for camera film. Silver bromide is also commonly used in sensitized bromide paper for creating enlargements and prints.34