C5C CARTRIDGE FORMULATION
TEXT BLACK PIGMENT PGI-250BK C1128P
CYAN CLI-251C PC25X-C
MAGENTA CLI-251M PC25X-M
YELLOW CLI-251Y PC25X-Y
PHOTOBLACK CLI-251BK PC25X-BK
PGI-250BK 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-251 colors used in this printer are dye inks.  The photoblack black  ink is used when printing photos on glossy paper.

If the printer has a duplex mode or two sided printing feature, photoblack dye is used on one side and text black pigment on the other.

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.

In May 2015, the inkset has changed to the PC25X Series. This was a huge upgrade providing much superior color  color rendition over the prior inkset and is now certainly one of the best inksets if not the best for this series of printers.
25X_5 inkset
Note Tabs below to go to other areas