Canon BJC 3000 Reference Manual page 86

Notes on Handling the BJ Cartridges
When you store the unused BJ Cartridges...
After you replace the BJ Cartridge with another one, always store the
unused BJ Cartridge in a BJ Cartridge container. If the BJ Cartridge is not
properly stored in the container, the ink will dry out and the BJ Cartridge
can no longer be used. Also, after removing the seal on the ink tank,
always insert it into a BJ Cartridge to prevent the ink tank from drying out.
Caution
Always store the BJ Cartridges and ink tanks out of the reach of small chil-
dren. If any ink enters the eye or is accidentally ingested, seek medical
assistance immediately.
Using the BJ Cartridges 86