Abstract
AbstractExaminations were made on the photographic effects of various electron and positive hole traps including sensitivity specks of chemical sensitizations, metal ions, and various dyes, showing that the photographic elfecls were markedly dependent upon the natures of the traps and emulsion grains used. It was indicated that photographic speed of grains was increased by traps only under the specific condition that the traps could be helpful for the increase of the efficiency of latent image formation at the surface of the grains.
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