Digital BW, The Print

> Where I've seen the problems are with a second overcoat 
> of more than 25%.
>

MPS may call for a longer dry time. Also I tend to overink to hit 
Dmax.
  
> Maybe both ink limit and composition.  With respect to the ink 
limit, 
> for example, the Crane SR didn't hit a post-overcoat dmax until 
120% 
> QTR load.  That's a very large amount of ink.

I wish I could lay down that much !

> 
> The MIS (Image Specialists) PK for the R1800 is the MIS K4-PK.  
It's 
> a lower load than the MP or 7600 PK.  It may be that with an 
> overcoat, I can go to the higher load ink and get a better dmax.

Gloss coating seems to produce the inverse effect of the matte media 
light diffused reflection.
 
> Clearly, this is still in the experimental stage.

More than time allows. Not mentionning the "empirical" K7 
partitioning... Roy did a fantastic job on QTR and I'm amongst the 
grateful ones, but what it really lack imho is the ability to draft a 
custom calibration chart. 
 
> I agree.  With a good pre-linearization ramp in the 90%+ range, I 
can 
> usually get fine shadow separation and still have only K in the 
100% 
> spot.

That's also my objective.

Olivier