Rehalogenization is the chemical process in which black metallic silver in photographic film or paper is converted back into silver halides. This technique is commonly used in bleaching during toning or image intensification, allowing photographers to manipulate the final image’s density, contrast, or tonality.
Understanding rehalogenization is essential for darkroom photographers working with traditional black-and-white processes, as it enables creative control over the image’s appearance. By applying this process carefully, artists can achieve richer tonal ranges, enhanced highlights, and customized visual effects in their prints.