How do I change the colour default to black & white when printing from Macintosh computers?
Click File on the Apple toolbar in the upper left corner.
From the drop-down menu, select Print.
A print box should appear. Depending on the default settings, you might have to expand the print box by clicking on the downward arrow, just to the right of the Printer drop-down menu at the top of the screen.
At the centre of the expanded window, open the drop-down menu that appears just below the Orientation and Scale options.
Select Color from this drop-down menu.
On the left of the screen there is a Color Mode drop-down menu which by default is set to Automatic. Change this option to Black and White.