Digital BW, The Print

Shilesh,

I have strongly stated my opinion of the situation on the Piezo3000 list a
couple of times now and I sent a summary of all the posts and data gathered
by this group to Jon directly. It is  clear to me that using the Piezo plug
in to print the PiezoTone inks offers no protection against excessive
warming and fading of the black ink and that replacing the black ink solves
the problem.

The fact that other drivers use more black or use it farther up the tone
scale than the Piezo plugin, is not particularly significant to my mind
other than it makes the failure more glaringly obvious. I think that anyone
still using the PT black is being very unwise.

This last test was to add data to the more extensive testing done by Paul
Roark because there is a tendency on the part of some to discredit his
findings based on the erroneous idea that he works for or owes loyalty to
MIS. What has been ignored is that Paul's 600 hour fade test of WN-PT and
300 hour fade test of Sel-PT were done with step wedges printed with the
Piezo plugin. I know because I printed the wedges he tested myself.

At this point I am satisfied the problem has been sufficiently documented
and I really don't want to get into a debate with anyone over the issue.

Martin Wesley



----- Original Message -----
From: "Shilesh Jani" <shilesh.jani@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Monday, October 14, 2002 6:39 AM
Subject: [Digital BW] Re: PiezoTone Black Fade Test


> 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]
>
>
>
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