Digital BW, The Print

Martin,

Thank you for clarifying this issue.  I wonder why folks at 
Piezography have not caught on to this. Did you cc: Cone, or post 
this on Piezography3000 group?

Shilesh

--- In DigitalBlackandWhiteThePrint@y..., "Martin Wesley" 
<mwesley250@e...> wrote:
> In order to verify for my self that replacing the PiezoTone black 
ink in the Selenium PiezoTone ink set with MIS-Full Spectrum Neutral 
black was the proper response to the rapid warm/fade shift of 
PiezoTone black ink shown by Paul Roark in his comparative fade 
testing of both PiezoTone inks sets to MIS-Full inks and as reported 
on prints by several other people, I did the following.
> 
> I printed a 21-step wedge with Selenium PiezoTone ink, including 
the PiezoTone black ink on Photo Rag 188 using the Piezo plug-in with 
the Photo Rag 188 profile and quality set to "Better". On the same 
sheet of paper I printed a second wedge in the same manner only for 
this wedge MIS-Full Spectrum Neutral black ink was substituted for 
the PiezoTone black ink.
> 
> I allowed the wedges to "settle" for 4 days and then measured C,M, 
Y and Visual densities of each step in the wedge and the 95-100 steps 
as well.
> 
> The Sel-PT with PT-K measured 1.83, 1.88, 1.78 and 1.84 with 
a "Warmth" (C-Y) of 0.04.
> The Sel-PT with MIS-FSN-K measured 1.69, 1.70, 1.67 and 1.66 with 
a "Warmth" of 0.02.
> 
> The sheet with the two wedges was then hung in a west facing window 
where it received indirect or direct sunlight all day. After 14 days 
I removed the sheet and measured the wedges again and got the 
following readings:
> 
> The Sel-PT with PT-K measured 1.51, 1.63, 1.69 and 1.58 with 
a "Warmth" (C-Y) of -0.18.
> The Sel-PT with MIS-FSN-K measured 1.60, 1.63, 1.65 and 1.61 with 
a "Warmth" of -0.04.
> 
> Basically the wedge printed with the PT black faded 0.26 density 
units and warmed 0.22 units while the wedge printed with the MIS-FSN 
black faded 0.07 density units and warmed 0.07 units. The shift in 
the PT black was 3 to 4 time the shift in the FSN black. The effects 
can be seen on the wedge as a slight reddish discoloration in the 90 
to 100% steps.
> 
> All of the spectrophotometer readings can be found in the files 
section of the group homepage in folder:
> 
> Files > Ink Sets > PiezoTones > Recent tests on PT black fade
> 
> Based on this additional information,  I continue to recommend that 
to avoid premature fading and warming in the dark tones, 85 to 100%, 
with either of the PiezoTone ink sets and the Piezo plug in or other 
driver, that you replace the PT black with the FSN black until a more 
fade resistant black is available from InkJetMall.
> 
> Martin Wesley
> 
> 
> 
> 
> [Non-text portions of this message have been removed]