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The film used in photography is
constructed of plastic strips coated with very tiny grains of
silver-halide crystals. These crystals undergo a photochemical reaction
when exposed to photons of light. The more crystals that are placed on
the film the higher the resolution of the image that is produced. When a film's emulsion is struck by light, it is chemically altered in a way that is very similar to being sunburned. When too many light rays are allowed to hit the film all the crystals fully chemically react creating a piece of film that no longer has a picture on it, but instead will be a white sheet. This is why it is important not to expose any film to light before it is developed. Don't allow any knucklehead to do this to you by accident. Mark your exposed film "Open in dark room only" |
| When the film is exposed and
ready to be developed, color film is placed in a solution containing
oxidizing chemicals. These chemicals cause the crystals to form a
color. There are three layers in the film each handling a primary color
of light, so there is a green, blue, and red layer. Red Light is always used in dark rooms due to the fact that it has a low amount of energy. In fact the energy is low enough that it does not cause the crystals of silver-halide to react, and therefore does not further expose the film. |
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