Digital BW, The Print

Joost,

I can't give you a definitive amount on the ink limits, but I can
offer a suggestion. Find the limit of the full black ink by watching
for slight puddling and or printing a pattern with some 1 pixel spaced
white lines surrounded by much larger areas of solid black. When the
edges of those 1 pixel lines start to get fuzzy, you have too much
ink. Now use this ink limit for all the other inks because it will be
much harder to determine the limit for the lighter shades.

As far as mixing goes, you never want to go above the maximum combined
that you set for the full black. With 5 gray inks, you should never
need to go closer than about 75 or 80 percent of the total ink limit
when you overlap the different gray inks. Depending on how much
overlap you use, you may have at least 2 inks firing at all times.
That's about all I can help with since I'm not completely up to speed
with QTR.