PHOTOGRAPHIC MATERIAL AND PROCESS FOR THE PRODUCTION OF DIRECT-POSITIVE PHOTOGRAPHIC IMAGES

摘要

A silver salt emulsion for the preparation of direct-positive images by imagewise exposure and development of developable fog light-sensitive material wherein the developable fog is destroyed on exposure to light and in which at least one fogged silver salt emulsion contains heterodispersed and irregular grains containing ripening nuclei and at least 10 percent of the grains have a size which deviates by at least 40 percent from the average grain diameter.