Digital BW, The Print

Ernst Dinkla <edinkla@...> wrote:

>... 
> With the 9000 + my own CIS loaded with MIS VM and the 10000 
> with MIS 7600 the least of my problem was actually the 
> Eboni. The PK and lighter shades were worse on the 9000, ...

That made me curious about how the MIS PK and Epson UC 7600 PK would 
do in a centrifuge test if both were put into 10% dilutions of my C6 
generic dilution base.  A couple of us are looking at using the C6 
base to dilute PKs for use in warm carbon channel to go with the HP 
cool dilutions.  The results of a 30 minute spin were that the 10% 
MIS PK had a change in Lab L (top of test tube to average) of 0.4%.  
The 10% 7600 PK changed 1.4%.  (A lower change is better.)

The relationship of the Lab L change to Lab B was the same as I've 
seen within other black pigment types: The larger the change in Lab 
L, the cooler the pigment.  Here the MIS 10% PF in the draw dawn on 
EEM had a Lab B = 4.4.  The 7600 had a Lab B = 2.8.

For comparison, Eboni-6 Y (the lightest at 2% Eboni and also the most 
stable of the Eboni dilutions) has a Lab L change of 2.9% and a Lab B 
= 1.3.

I've put a graph of these results on the web at 
http://www.paulroark.com/BW-Info/light-Warm-Spin-Graph.jpg 

Here, heavier appears to correlate with cooler.  


Paul
www.PaulRoark.com