PQ developer is a type of black-and-white photographic developer that combines the developing agents phenidone and hydroquinone. This combination offers a balanced development process, producing fine grain, rich tonal range, and excellent contrast in film or paper prints.
Widely used in traditional darkroom photography, PQ developers allow photographers to achieve consistent, high-quality results. The synergy of phenidone and hydroquinone ensures efficient development, making PQ developer a popular choice for both professional and enthusiast photographers working with black-and-white media.