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Researchers at Kodak have developed a photographic film that works in low
light conditions without producing a grainy image. By making the film twice as
sensitive to light, clear pictures can be taken even in dim light without a
flash, says Ian Gould of Arizona State University, who worked with the Kodak
researchers. Images are formed on photographic film when incoming light knocks
electrons from dye molecules held in the film into neighbouring silver halide
crystals. This process produces clusters of silver atoms that make up the image.
By adding another electron donor molecule to the film, Gould and his colleagues
can produce twice as many electrons for every incoming photon, so the silver
clusters form twice as quickly.