Have you ever had to print a paper or mailing label NOW and realized your black ink cartridge is out of ink? As much as I try to keep an extra on hand, sometimes I run out without a backup. Something I’ve found that works in a pinch is to simply remove the black ink cartridge. This forces the printer to use the color cartridge to print the document instead.
The label on the right was my first attempt at printing a mailing label before realizing that I was overdue for a new black cartridge. The label on the right was printed with the black cartridge removed.
My printer will usually print one or two jobs this way without complaining, then I may have to put the old cartridge back in for a bit then remove it again if I need to print something else. Usually by that time I have been able to get a replacement cartridge.
It’s always better to be prepared, but in a pinch this trick works like magic.