Uranium nitrate is a chemical compound historically used in photographic toners and developers to alter image tones and enhance contrast. It was primarily employed in darkroom processes to achieve specific colouring effects in black-and-white prints.
Photographers working with traditional chemical processes need to handle uranium nitrate with care due to its toxic and radioactive properties. Understanding its use and safety precautions allows for controlled toning effects while maintaining a safe working environment in the darkroom.