Sure it is a tank, it is ink. Do you believe that professional printing uses inkjet printers with cartridges? I believe that largely not even inkjet printers

Sure it is a tank, it is ink. Do you believe that professional printing uses inkjet printers with cartridges? I believe that largely not even inkjet printers are used in professional printing (unless maybe for some low number, large formats), as said, but if they were actually used, they surely would not use "cartridges".