QTR-Quadtone RIP

Hi all, 

The question of the day: how do you choose the black boost
while creating a curve? 

I usually do the following: BB = IL + 10 (IL:
Ink Limit) because this is what I see on provided curves in QTR. But is
there a particular way to determine it? 

Have a nice day, 

Sylvain 

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