Digital BW, The Print

Kari, I'm Sorry, I didn't finish that thought.  Even the gray inks
(Small Gamut) MIS, Piezo, etc. do experience metamerism to a degree.
Some show much less than others. 

With a proper profile, even the Generations or MIS archival color inks
can make a very acceptable black and white print. But you must have the
color inks/paper profiled. Even then, some images tend to show more
metamerism than others. There isn't much metamerism with Generations or
MIS inks. If you get a great looking neutral print in daylight, it tends
to be just a tad warm in tungsten lighting, but certainly not
objectionable. And of course the paper you use contributes a lot to how
much metamerism you see.

Jerry