The primary element for light capture in photography is the silver halide crystal. When exposed to light, this crystal forms a small, stable "latent image" that is highly amplified during photographic development. By common usage, the term "emulsion" denotes what is actually a dispersion of tiny silver halide crystals (grains) in gelatin.
Silver Halide Crystals 
Added 6 years ago by Anne Lai
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Silver Halide Crystals 
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The primary element for light capture in photography is the silver halide crystal. When exposed to light, this crystal forms a small, stable "latent image" that is highly amplified during photographic development. By common usage, the term "emulsion" denotes what is actually a dispersion of tiny silver halide crystals (grains) in gelatin.
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