Digital BW, The Print

> What the 2100/2200 needs is a way to use all its blacks,
> i.e., the dark black AND the light black cartridge, and
> not any of the colors.  This would produce very neutral
> prints with minimal metamerism, but a less obvious dot
> pattern than the darkest cartridge alone.

That's based on the assumption that the light black is actually
neutral. It's not. Printing with the two blacks will get you a print
with a very varm brown sepia-tone.