Abstract: Photographic processing apparatus is disclosed which consists of a plurality of removable partitions mounted in a frame to form compartments. Lining bags of flexible or semi-rigid plastics sheet material are disposed in the compartments to form watertight tanks for the processing liquids into which the photographic materials to be developed are dipped. There is also disclosed a flexible or semi-rigid plastics bag for use in the apparatus which includes an integral compartment in the region of its bottom provided with perforations wherethrough agitating gas passed into the compartment can pass into the processing liquid.