Silver halide is a unique imaging receptor because the absorption of only a few light photons can produce up to 109 silver atoms. Recently, the cost of silver has increased dramatically although there is no shortage of the metal. These price increases have focused attention on making more efficient use of this precious metal in silver halide films and on its recovery after use. Photographic manufacturers have developed technology necessary to make X-ray films using less silver without affecting photographic performance. Other non-silver imaging systems have been developed for use when high photographic speed is not required.