QTR-Quadtone RIP

Hello again,

being finally able to make some custon curves for both Silver Rag (it
is a shame that you can't buy this paper in the netherlands...if any
dutch reseller reads this: import this paper, it is so beautiful!) and
Innova PScotton i have just one question on which i can't find any
answer: After making the calibration target, i have to measure (or
see) on which step i can't see any more density change towards the end
of the steps. But which color do i have to look for? On the black line
and some coloured lines i see no significant change after 50 0r 60
percent. But on the light blacks the steps continious to increase in
density. So where do i have to look for? I have an Epson 2400.

thanks, Steven.