Your product comes with Matte Black and Photo Black ink
cartridges. Although both cartridges must be installed for your
product to work, it can print using only one type of black ink at a
time.
Your product switches the black ink type
automatically, depending on the type of media you load. Because
this process consumes some ink, so you should avoid switching black
ink more often than necessary and select a default black ink type
for the type of media you print on most often.
Note: To disable
automatic black ink switching, press the
setup button and select
System Administration >
Printer Settings >
BK Ink Auto Change >
Off.