Take a lint free cloth dampened with water and take the cartridge and gently rub the ink orifices with long stroke. Then dab on dry portion of cloth and reinsert in printer. You may have to do this several times. The cloth should end up with visible ink left.
If your computer is out of printer ink, try this before using a new cartridge.
"Don't let your computer tell you what to do" My Epsom showed 2 cartridges very low & a warning. Wanting to empty them complely for a special print, I loaded some cheap photo' gloss paper (£1 for 10 sheets) & ended up with 10 excellent prints & still going.