Digital BW, The Print

Her is a response Paul put out some time ago for a request for cool 
curves:

"I agree cool curves would be good, but I have not had time to making 
them
yet. I explained how to adjust the neutral curve for warmer or cooler
prints in my Readme file. Basically, just make offsetting moves of 
the cyan
and magenta inks (red and green curves).

The one cool curve I did make, for PermaJet's Oyster paper, moved the
neutral Red curve down (adding more ink) 18 at 63 (that is, from (63, 
93) to
(63, 75), 32 at 127 (the mid point), and 41 at 191. I moved the green 
curve
up 22 at 63, 37 at 127, and 46 at 191. That curve also has some shadow
point below 63 that had some offsetting moves. The changed above took 
the
tone from neutral to 0.06 units cool. (Carbon is 0.10 warm for 
comparison.)
I think about 0.06 units cold is getting close to as cool as I'd want 
to go
and still have a "normal" looking print. If you go too far the print 
starts
looking blue instead of gray"


QTR also has cool curves that are quite cool.

Hope this helps

Peter