A one-shot developer is a photographic chemical solution used to develop film or paper that is intended for single use only. Unlike replenishable developers, this solution cannot be reused or topped up after processing, ensuring consistent results for that batch.
One-shot developers are often used in commercial or educational darkroom settings where predictable and uniform development is important. They simplify workflow by eliminating the need for monitoring chemical strength over time, though they may generate more waste compared to replenishable systems.