Inside the photographic emulsion are millions of light-sensitive silver halide crystals. each is a compound of silver plus a halogen (such as bromide, iodine or chlorine) held together in a cubical arrangement by electrical attraction. when the crystal is struck with light, free-moving silver ions build up a small collection of uncharged atoms. These small bits of silver, too small to even be visible under a microscope, are the beginning of a latent image. developing chemicals use the latent image specks to build up a up density, an accumulation of enough metallic silver to create a visible image
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