A film is a basic tool for recording images in a camera. It is a flexible, transparent base, coated with light-sensitive emulsion containing silver halide crystals. When a black-and-white film is processed, silver halide crystals which had been exposed to light get reduced to black particles of silver and form a permanent negative image.
[...] Choice of film speed Introduction A film is a basic tool for recording images in a camera. It is a flexible, transparent base, coated with light-sensitive emulsion containing silver halide crystals. When a black-and-white film is processed, silver halide crystals which had been exposed to light get reduced to black particles of silver and form a permanent negative image. The unexposed crystals of silver halide are then chemically removed at the end of the process and the film is dried. [...]
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