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I am curious why my Canon printer, an MG6320 (but I have also seen this on MG5320 and MG5220), requires me to use two black ink cartridges, one labeled BK and the other labeled PGBK. When I do a nozzle check, the one labeled BK prints a grid, while the one labeled PGBK prints a black rectangle. Which one is used for which purpose?
You see. Just in case. ;) – Bleeding Fingers – 2014-03-15T20:03:32.550