Canon BJC-2100 Series User Manual page 157

Printout Is Unsatisfactory
C 3 R - BJ ?
HECK E FILLED INK TANK INSTALLED IN THE CARTRIDGE
You may not be able to achieve satisfactory performance with an ink tank
that has been re-filled or that uses third party ink. It is recommended that
you use ink tanks specifically designed for use with the Canon BJ
cartridge.
Using BJ Cartridges
Troubleshooting 157