Photographic chemicals are substances used in the process of developing photographs from film or digital images. These chemicals include developers, stop baths, and fixers, each serving a specific purpose in the photographic process. Developers convert exposed silver halides in the film into metallic silver, creating a visible image. After development, a stop bath halts the chemical reaction, while a fixer removes unexposed silver halides, ensuring the image remains stable and light-resistant. Common photographic chemicals include sodium thiosulfate for fixing and hydroquinone for developing. Proper handling and disposal of these chemicals are essential for safety and environmental protection.