Digital BW, The Print

Martin,
Comparing Lyson and Piezo before the fading test:
- The Lyson has a richer black. I like that very much.
- However the Lyson does not have the superfine "dotsctructure" 
that the Piezo print shows. Fine detail is much better on the 
Piezo.
If you compare the prints from a distance, the Lyson looks better 
because of the richer black. At closer inspection the Piezo is the 
winner because of the better fine detail. 
My personal impression, after everything I have seen and read 
about this subject , is that the dyes in the Lyson inks are 
responsible for the richer blacks but at the same time for the 
dramatic fading behaviour. (Unacceptible for me). The pigments 
in the Piezo seem to be responsible for the better longevity of 
that system. John Cone has stated that a very small amount of 
dye has been added to the pigments. I think that small amount 
explains the slight degree of fading of the Piezo print and the fact 
that the slightly "greenish" look in the highlights and midtones 
disappears after such a long exposure in the sun.

There is still one thing that I do not understand:
Whynot is the Pizeo process designed in such a way that in a 
100% black they use an overlay of all 4 inks.?
That is the way a duotone or tritone process in offset-printing 
works to achieve rich blacks and animproved tonescale.
As I understand from the examples on John Cones site, each of 
the four Piezo BW iks now are used just for a part of  greyscale. 
If in a 100% black all 4 tones would be present as a solid area, 
that would increase Dmax.of the Piezo process.

Best regards,

Jo Brunenberg
http://www.jobrunenberg.com

--- In DigitalBlackandWhiteThePrint@y..., "Martin Wesley" 
<mwesley250@e...> wrote:
> Jo,
> 
> Thank you for the info on the Lyson inks. I have been waiting for 
> someone to post something about the Lyson.
> 
> Aside from the archival and fade issues, how would you 
compare the 
> quality of the images prior to your test?
> 
> I ask because there might be commercial applications where 
long life 
> and fade resistance are not so important. The initial Dmax of 
the 
> Lyson print was on a level with silver prints.
> 
> Martin
> 
> 
> 
> --- In DigitalBlackandWhiteThePrint@y..., Jo Brunenberg 
<jobnl@e...> 
> wrote:
> > 
> > Piezo versus Lyson Small gamut
> > 
> > .............and the winner is: Piezo B&W!
> > 
> > I carried out a small, nonscientific, experiment:
> > 
> > During the complete month of August (very sunny in the 
Netherlands 
> where I
> > live) I exposed two black-and-white prints to the sunlight in 
my 
> roof-window
> > on the south. So a rather tough test.
> > 
> > The results are remarkable!
> > 
> > About the prints:
> > - One print was the Piezo BW sample (stairs) which I 
received from
> > Inkjetmall (paper: Somerset Enhanced)
> > The other was a Lyson small gamut BW print (with very rich 
deep 
> solid
> > blacks) that was made for me by Lyson (paper: Lyson 
Standard Fine 
> Art)
> > 
> > Half of both prints were covered by heavyweight black paper.
> > The other halfs were exposed to the sun.
> > The result was judged visually and by using a densitometer.
> > 
> > The results after one month sun exposure:
> > 
> > - The exposed part of the PiezoBW print did not change in the 
dark 
> grey and
> > black areas. There is a very slight fading in the highlights. 
The 
> exposed
> > part is slightly less "greenish". The print still is very 
> acceptable.
> > (the slight fading is just visible to the eye and a densitometer 
> does read a
> > minor change).
> > 
> > - The exposed part of the Lyson print shows a dramatic 
fading as 
> well as a
> > colorshift. On the unexposed part the greys are slighly 
"greenish", 
> like the
> > Piezo BW. After exposure the greys have a strong 
sepia-magenta cast.
> > The fading iof the Lyson print is visible in all tones from 
> hihglights up to
> > the shadows but is most visible in highlights and midtones. 
The 
> print became
> > completely useless.
> > 
> > The densitometer tells me:
> > 
> > PiezoBW
> > highlight		
> > before exposure: D 0.20
> > after exposure: D 0.18
> > 
> > midtone:
> > before exposure: D 0.60
> > after exposure: D 0.59
> > 
> > shadow:
> > before exposure: D 1.84
> > after exposure: D 1.84
> > 
> > Lyson small gamut
> > highlight		
> > before exposure: D 0.20
> > after exposure: D 0.02
> > 
> > midtone:
> > before exposure: D 0.60
> > after exposure: D 0.30
> > 
> > shadow:
> > before exposure: D 2.26
> > after exposure: D 2.00
> > 
> > 	
> > Best regards,
> > 
> > Jo Brunenberg
> > http://www.jobrunenberg.com
> > 
> > 
> > 
> > 
> > 
> > 
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