These were stored awaiting potential use as purchased from GO-INKS on Ebay over the years,  Seem to have loads of BLACK ink cartridges where there are no other colours there (apart from 1 x CYAN / BLUE remaining).... possible down to the BLACK cartridges being either fuller or just longer lasting.   DX8400 Printer has just shut down needing DEALER repair of waste pads and reset....then a used DX8400 just purchased has RED and YELLOW nozzles blocked up probably with dried ink is of no use and requires clearing by probably a dealer..... So giving up on this model and buying something newer.   Awesome Printers over the years but, time to move on.