REFILLING INSTRUCTIONS OF HP 21:

1.Remove the label located at the top of the cartridge (Do not throw away this label).

Note:The labels on the illustrations to the right have already been removed.

2.Insert the needle into the cartridge of the filling hole. Slowly injecting ink into the cartridge until it is full. Do not over fill the cartridge (if you start to see ink coming out of the refill hole, please stop filling and reverse the refilling process. Remove about .5ml of ink from the cartridge or enough to cease the over flow of ink in the cartridge) , it is always better to under fill than overfill. You can always add more ink into the cartridge later.

3.Replace the orignal label as it was before you removed it. You may use small amounts of glue to help the adhisve of the label stick back onto the cartridge. Remember not to block or spill any glue in the air passage maze. This can result in having priting problems with your cartridge. If the label to worn, then use the sticker dots provided in your refilling kit to seal the refilling holes on the cartridge. Use a piece of tape to seal the hole(s) made in the top label.

Note:The cartridge will leak if the holes are not sealed properly.

4.Reinstall the cartridge and run 1 - 3 test pages as per printer instructions. If necessary leave cartridge in printer for up to 24 hours to allow ink to flow to the print head. The time is greatly reduced if the cartridge is refilled before it is completely empty.