With CIJ, a high-pressure pump pushes ink through nozzles on the printhead, creating a continuous stream of ink drops. Within this stream, the printer electrically charges the individual drops that will form the printed text. A magnetic field inside the printhead then deflects these charged drops towards their target location on the substrate. The majority of drops have no charge and so don’t get deflected. These land inside the printhead and are returned to the ink supply to be recirculated.