Print without color background

[Bill]

I used color-coded backgrounds to differentiate my calendar appointments.
However, when I print a Month-view of the calendar on my non-color printer,
the colors print as grayscale (sometimes making it hard to read the black
text) -- whether or not the Print as Grayscale box is checked or not. I want
to be able to print the Month-view with only the text and gridlines printing
and all colors showing up as white.

Is there a way to do this?

Thanks in advance,

Bill