When in non-borderless mode, i can print black dots, but in borderless (a4 or a3) i get grey instead of black.
I'm using turboprint pro on fedora 8 with a canon pixma ix4000.
the ix4000 printer and many other Canon printers can't use the pigment black in borderless mode because the print head layout is not suitable for printing borderless.
Black is mixed out of cyan, magenta and yellow instead - this is also the case with Canon's Windows printer drivers.