What role does silver produced when photographic film negatives are exposed play in the development process?

When the film is exposed, due to the action of light energy, the silver halide on the film is decomposed into silver ions and halogen ions, and more silver ions are decomposed in the more sensitive parts; Lower photosensitivity and less decomposition of silver halide. The electrons released by the decomposed silver ions when they meet halogen ions become silver atoms, forming a latent image. The development process is to reduce the silver halide that has been exposed to light on the film into metallic silver by the reduction of the developer. Because the sensitivity of different parts of the film is different, more or less silver particles are reduced, so the density of different parts of the film is different, while unexposed silver halide remains on the film. Then, the unexposed silver halide is dissolved in the fixing solution by the dissolving action of the fixing agent, so as to prevent it from changing color during exposure and being difficult to store for a long time. After fixing, only the image composed of silver particles remains on the film.