Digital BW, The Print

Martin,

You wrote:

>I really am beginning to wonder if the PT-K and the Gen-K are not the same
>ink. ...

>Also check out Paul's fade testing of the Gen and Indelible blacks in
>folder:

>Files > Ink Sets > MIS

>and then take a look at his fade test of the PT-K, PzoTone-VM-FS-K-100
>hr fade test.jpg , in folder:

>Files > Ink Sets > PiezoTones > PiezoTone vs MIS-FS

>...

Although comparing test strips from different runs of the fader increases
the chances of other, random factors influencing the results, the two tests
you noted above suggest to me that PT-K and Gen-K are not the same.  The Gen
K seemed to perform much better.

Note also that the control test strips (both K-only on EAM) are much
different.  The Gen-K has a visual density of 1.82, while the PT-K has a
visual density of 1.74.  The Gen-K also is 0.02 units cool at the 100% spot,
whereas the PT-K is 0.03 units warm.  Note that the cool black of the Gen-K
would make it a better fit for the "selenium" tone due to this cool black.
(This is on EAM.  Results on PhotoRag may be different.)

Gen. Enhanced K is the one I recommend to others who want a deeper black.

I do think the inks are similar in that they appear to be hybrid pigment-dye
inks.  That alone might make the separations you've seen in water appear
similar.

Paul
http://www.PaulRoark.com