A photographic processing chemical supplier for supplying photographic processing chemicals, in particular dry chemicals in powder form to a developer solution preparing means, comprising: a container having a receiving opening through which said photographic processing chemicals are receivable in said container and a supply opening through which the received photographic processing chemicals are supplyable out of said container to said developer solution preparing means; wherein an attaching means constituted such that a cartridge is removably attachable to the supplier by means of said attaching means; and opening/closing means for opening and closing said receiving opening constituted such that said receiving opening is closed if said cartridge is removed and such that said receiving opening is openable or open if said cartridge is attached.