Digital BW, The Print

Mixologists,

I have looked at the custom tinting section on the MIS pages and have a
question.  As I understand it the hue for making a custom-toned ink set is
controled only in the yellow position.

If one were making a Van Dyke or sepia set of inks wouldn't the darkest
value of brown then become the "black" base from which all the other tints
are made?

In other words I mix a batch of CMY to achieve sepia or brown, lower its
value with black and use that for the tinting base.  

thanks,

AZ