Canon BJC-55 - Manual (Page 56)

8.
If you are installing a new BJ Cartridge, remove the orange
protective cap and orange protective tape from the BJ Cartridge.
To avoid staining your clothing or articles in your work area, do not drop
or shake the BJ Cartridge. The ink in the BJ Cartridge can stain fabric
permanently.
9.
Insert the BJ Cartridge as shown below. Align the marks on the BJ
Cartridge and the cartridge holder (yellow-yellow, black-black).
54 Chapter 3 Printing
Protective tape
Protective cap
Insert the BJ Cartridge to
align the marks (
).