PPT - White text prints as black in greyscale mode

I'm whipping up a Powerpoint presentation for a client and am running into an issue with printing. The title slides have dark backgrounds with white text; when I or the client print that slide in color everything's fine, but when we try printing in b&w or greyscale all the white text prints as black. I understand that PPT by default does all text as black in b&w white mode, but I would think it could handle white in greyscale.

Is there some fix for this?

m19