How to disable PGBK ink on a Canon printer and use BK for black?

PGBK ink is intended for uses like text, it's smudge resistant and good for fine lines. BK ink is intended for photographs, it's richer. The printer defaults to PGBK for text, lines etc - unless it thinks they are part of a photo.

So, you can force a Canon printer to use BK ink instead of PGBK by telling it that you are printing a photo onto plain paper.

Warning: as user395664 commented, doing this does substantially slow down printing time, even on "standard" quality.

In printer settings, change paper type to "high resolution paper". Problem solved! Thanks ~ Dan Richard ~ http://www.danrichard.com/2011/07/14/how-to-use-the-other-black-ink-cartidge-when-one-is-empty-on-your-canon-pixma-mx850-printer/