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Step 1
Take the empty ink cartridge out of the printer and lay it down on some newspapers in an area where a spill will not be disastrous. You can wear gloves if you're afraid of staining your hands with ink.
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Step 2
Take off the label on top of the cartridge. You'll see a small air vent or series of air vents underneath, which lead to the cartridge's inkwell. In the black cartridge, there will be one air vent in the middle. In the color cartridge, there will be three holes placed around the perimeter. You can determine which is which by facing the cartridge so that you could read the label normally were it still attached. The air vent for the cyan inkwell is at the 3 o'clock position (right hand side), the air vent for the magenta inkwell is at the 9 o'clock position (left hand side) and the air vent for the yellow inkwell is at the 12 o'clock position (center, near the top edge).
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Step 3
Take the syringe containing the ink color you need from an ink refill kit. (Kits are available at any office supply store. Some kits may use bottles rather than syringes, with needles you will need to insert into the bottles first.) Slide the syringe or needle gently into the air vent of the empty inkwell and gently squeeze it. The ink should flow in very slowly--no more than 1 ml a second or so--to avoid overflowing. The size of the inkwell varies. Standard HP 60 color cartridges hold 6 ml of each type of ink. Black cartridges hold 10 ml worth of ink while XL cartridges and those from companies other than Hewlett-Packard may vary in how much they hold.
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Step 4
Remove the needle and replace the ink cartridge in the printer. (You can put the label back on top of the cartridge if you want to, but it isn't necessary to run the printer.) Run one or two cleaning cycles and then start printing again. You may want to print out a few test copies to make sure the ink is flowing properly.