Good evening Howie

You've almost answered your own question here:

"my printer insists on printing these cells in black - as if the fon
is not set as white at all."

Conditional formatting just makes your cells "look" a different colou
to you - to the computer there is no difference.  If you manually se
your text to white on white, then XL will recognise it as such, but n
so with conditional formatting.

Additionally, if you try using a macro to determine the colour of
conditionally formatted cell, it will not return the colour index o
the colour that YOU see.

Kind of difficult to explain, but hope that settles it.

HTH

Dominic

Howie

I'm guessing that File>Page setup>Sheet  "black and white" is checked.
Uncheck it.

White is a color and needs to print in color.

Gord Dibben Excel MVP