I finally got the ink cartridge to partially work in my HP printer. The problem is my black ink slowly fades as I continue my printing. Any ideas why?An HP 56 black will do that if they are overfilled. You may want to use the syringe to remove 1-2 ml of ink from the cartridge, re-install and try a few cleanings. If the problem persists, run several cleanings back to back to see if you maintain the quality. If not, you may have some dryness in the membrane behind the print head. There is very little you can do in the case. You may want to try soaking the print head itself in some blue window cleaner. Dry it off and again reinstall and run a few print head cleanings. If none of these suggestions remedy the situation, you may unfortunately have to replace the cartridge. If you are using a universal refill kit as opposed to one that is designed for your particular cartridge, the ink may be too dense.
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