Copper sulfate is a chemical compound frequently used in photographic processes such as bleaching, toning, intensifying, and reducing prints or negatives. It helps modify image density, contrast, and colour in creative or technical darkroom work. Like other photographic chemicals, copper sulfate must be handled with care, using proper safety procedures to avoid contact or inhalation. Its inclusion in various darkroom solutions makes it a versatile tool for photographers seeking to achieve precise visual effects or enhance print quality.