Bulk Ink Refill InstructionsUpdated December 5, 2007
HP #74 CB335WN and #74XL CB336WN Black Inkjet Cartridge
The ink in this cartridge is retained because the cartridge has an internal sponge. This cartridge is physically identical with the #27 C8727AN cartridge. HP puts less ink into the other cartridge when new.
Step 1) Put the cartridge on some paper towels in an area where you can tolerate a spill.
Step 2) Remove the label on the top of the cartridge. You will find 5 holes.
Step 3) Put the holes on top of the cartridge. Turn the cartridge so that the single hole is farthest away from you and the other 4 holes are closest to you. You may fill through any of the following holes:
Step 4) Keeping the cartridge on paper towels, take a syringe bottle and fill it 1/2 full of ink -- about 15 ml. When new, the cartridge holds 19 ml. (The 74XL holds more.) When full, the cartridge holds 19 ml.
Step 5) Insert the needle fully into the hole. Get the tip of the needle to the bottom of the cartridge. Inject the ink very S-L-O-W-L-Y and watch until the sponge is saturated. You must get the needle deep into the hard sponge.
Step 6) It is not necessary to reseal the holes.
Step 7) Set above a paper towel for an hour as a drip precaution, perhaps over a small cup. Expect a few drips. Do not allow the cartridge to touch the paper towel at this point, since the towel will draw out the ink.
Step 8) For best results, let sit overnight before using. Tape over the vent holes if you plan to store for awhile to prevent drying out of the ink.
If you have a leakThere are only 2 reasons to have a leak with this cartridge:
If the Cartridge doesn't PrintThis simple cartridge is merely a sponge-filled box. Try the following:
To Clean Your SinkThe ink is water-soluble. Use plenty of soap and warm water. You may also need to use Comet or a similar cleaner if the stains persist.
To Clean Your HandsOn hands, the best substance to use is Ink Be GoneTM, a specially developed hand cleaner available from ACSI Bulk Inks. (To place an order, Click Here.)
To Place An Ink OrderYou can telephone us at 1-888-728-2465 (USA Tollfree) or 1+740-374-9949. You can also Order Online or by other ways including by Fax, or by Postal Mail, or by EMAIL.