Silver Bromide Colour

Silver bromide is a chemical compound consisting of silver and bromine atoms, with the chemical formula AgBr. It is a white crystalline solid that is insoluble in water but soluble in solutions containing ammonia or thiosulfate ions.

When exposed to light, silver bromide undergoes a photochemical reaction that results in the formation of metallic silver particles. This process is used in traditional black and white photography, where silver bromide crystals are coated onto photographic film or paper.

In its pure form, silver bromide appears white or pale yellow. However, when it is exposed to light, the silver bromide crystals absorb the energy from the photons and the silver ions are reduced to metallic silver. This creates dark regions on the film or paper, which correspond to areas in the original scene that received more light. The remaining silver bromide crystals that were not exposed to light remain unchanged and appear pale in color.

Therefore, the color of silver bromide depends on its exposure to light. Unexposed silver bromide appears white or pale yellow, while exposed silver bromide appears dark or black. In photographic paper, the color of the image can be further manipulated through various development and toning processes.