Bright spot

A cure may be at hand for underexposed Christmas photos. Standard films need 10 to 30 photons of incident light to generate a single dark spot on the negative. The light produces electrons when it hits the film’s silver halide crystals, but in standard films, many of the electrons are lost before they make the metallic silver that creates dark spots. Jaqueline Belloni of the University of Paris-Sud found that formate added to the film (Nature, vol 402, p 865) kept the electrons from straying,
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