Abstract
Abstract In order to achieve latent image formation in photographic emulsions with high efficiency and stability, many attempts are made to modify the silver halide grains in emulsions. While these attempts include chemical sensitization, hypersensitization, and latensification, chemical sensitizations are most effective and are widely used in practical emulsions. Chemical sensitization is a method to place a small amount of chemical species on the surface or in the interior of silver halide grains by chemical reactions taking place during the ripening of emulsions (i.e., agitation of emulsions at an elevated temperature for a certain time period). Hypersensitization is a method to treat coated emulsion layers before exposure to light for improvement of the efficiency of latent image formation. Latensification is a method to treat coated emulsion layers after exposure to light but before development in order to increase the developability of latent subimage centers and small latent image centers.
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