Positive process using a low coating weight silver halide

摘要

A process for obtaining camera speed direct positive images which employs a photographic element comprising a film support, a layer of photosensitive silver halide, and a layer containing a colorant (e.g. colloidal silver). The silver halide layer is first imagewise exposed, and the latent image developed in the presence of a compound capable of producing sulfide ions e.g. thiourea, and then the photographic element is immersed in a chemical bleach which removes the silver image generated in the silver halide layer and removes the colorant in the areas corresponding to the exposed areas of the silver halide layer, leaving a direct positive image in those areas of the colorant-containing layer which are directly under the unexposed nonimage areas of the silver halide layer.