Digital BW, The Print

Paul,

I put the file you sent in the "Files" section in the "Message 
Related Files" folder.

An interesting result. With eyeball alone the end results are much 
more similar than the two control images. Both seem to lose the 
cooler tones but the MIS appears to have less to start with ends up 
warmer than the Piezo.

The tonal shift is much more noticable than the fade. I would guess 
that the actual fade is only a fraction of a f-stop.

Martin

--- In DigitalBlackandWhiteThePrint@y..., "Paul Roark" 
<paul.roark@v...> wrote:
> Mike,
> 
> You asked:
> 
> >Has anyone else measured the actually loss in density of Piezo 
prints?
> 
> I ran a comparison fade test in my florescent light tester with MIS
> (standard quads) and Piezo inks.  Both were on Epson Archival 
Matte, and
> both were in the fader at the same time, so other possible 
variables were
> kept to a minimum.  After 300 hours the MIS 50% patch had lost 4.6% 
density.
> The Piezo test strip had lost 7.6% in the 50% patch. (The two 
blacks had
> both faded 15%, but because of the intensity of the light, the 
black would
> absorb more and heat up more.  So, I think the test conditions 
exaggerate
> the relative fading of the dark tones.)
> 
> For most parameters I'm looking at, by 300 hours in my fader the 
rate of
> change has slowed considerably.  So, while these prints may never 
totally
> stabilize, I think at the 300 hour point we can see what the prints 
will
> look like after the prints have "warmed" completely.
> 
> While the Piezo faded 65% more than MIS, neither had really faded 
that
> dramatically.  I continue to agree with the consensus of south-
window
> testers that color shifting is more significant than fading.  I'll 
send the
> scans of the test strips and control strips to Martin to put in the 
files
> section of the forum.  (See Fade-MIS-Pzo-300Hr.jpg)
> 
> I would be curious if the scanned images look like what south-
window testers
> see, and how long it takes for south-window prints to take on this 
color.
> 
> EAM is the champ when it comes to fade resistance among the paper 
I've
> tested.  I don't know what paper was being used below, but the 
alleged 2
> stop fading in 60 days seems extreme.  I would guess there are some 
factors,
> perhaps including display conditions, that we don't know about.
> 
> Paul
> http://www.PaulRoark.com
> 
(snip)