The theory concerning the formation of
electron traps in a silver halide crystal which is exposed to light
or X-rays. The traps can capture electrons released by ionization in
the crystal. These negatively charged electron traps which are
produced during film exposure, can attract the interstitial silver
ions in the crystal. The silver ions are then reduced to atomic
silver in the traps. These few silver atoms present in a silver
halide grain following exposure act as catalyst in the development
process, so that the rest of the silver ions in the grain are
reduced to metallic silver.
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