CANON
BCI-21/24 / BC-232
BLACK

MODIFY THE CARTRIDGE
The cap on the top of the cartridge must be removed.  This can be accomplished very easily with knife. (a dull knife) Hold the cartridge with the label facing you.  Insert the blade of the knife where the cap meets the cartridge and twist. The cap should pop off very easily.   Be careful not to break the finger on the back of the cartridge.   This finger holds the cartridge into the print head.  Throw the plastic cap out, it is not necessary to put it back on the cartridge.

Canon ink refill instructions

IDENTIFYING THE VENT HOLE
Once the cap is off hold the cartridge so that it matches Diag. 1. The 3 larger holes are not fill holes.  The small hole in the center of the cartridge is the fill hole. In order to inject the ink you must first drill out the fill hole.  To enlarge the fill hole, drill until you feel the drill go through the other side. Optionally you may put a piece of tape over the outlet hole to prevent the cartridge from dripping while refilling.    You are now ready to inject the ink.

INJECTING THE INK
Inject the cartridge with about 4 cc of ink. Insert the needle all the way into the cartridge deep into the hard sponge.
Inject S-L-O-W-L-Y to fill the entire cartridge. Be sure to remove and re-insert the needle a few times to expose the entire sponge to the ink.
Set on a paper towel for an hour as a drip precaution. Expect a few drips. Cover all holes during storage to prevent leaks and evaporation.

Replace the cartridge and run 1 - 3 cleaning cycles as per printer instructions.
Or print the following pages:
http://www.refillinstructions.com/black.htm for Black
For best results, leave cartridge in printer for 8 hours after refilling so the ink can saturate the entire sponge.

A Refill Kit should include Ink plus the following:
1 - 10cc Syringe for Black
1 Thumb Drill

Quality Inks for your Printer
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Printer ink and Refill kits for your Printer