Canon Color Bubble Jet BJC-4400 Series Service Reference Manual page 221

Slide the
BJ cartridge
out of the holder.
Store or If you are replacing an old BJ cartridge, dispose of the old
dispose of the cartridge properly.
BJ cartridge.
If you are switching cartridges, you must store the
cartridge you are removing in the Ink Cartridge
Storage Box.
Chapter 4 Maintaining the Printer 4-13