C4B CARTRIDGE FORMULATION
TEXT BLACK PIGMENT PGI-5BK C1020P
CYAN CLI-8C C2032D
MAGENTA CLI-8M C6121D
YELLOW CLI-8Y C0797D
PGI-5BK ink is text black pigment used solely when printing on plain or copy paper. The PG at the start of the cartridge model number is shortform for PiGment. Text black pigment ink is preferred for sharper text printing, has less bleed on papers, is waterproof and will not fade. Text black pigment ink is slightly slightly costlier than dye ink.

All other CLI-8 colors used in this printer are dye inks. 

Because of the way an inkjet printer works, a small quantity of color ink is still used during maintenance functions even if you print mainly text.
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