Digital BW, The Print

Found this link yesterday of anyone if anyone is interested

http://www.livick.com/method/inkjet/pg1.htm

Not into coating myself but thought you lot might like a read

Gareth

 --- In DigitalBlackandWhiteThePrint@yahoogroups.com, Robert Morrison 
<rmorrison@p...> wrote:
> I haven't tested the hydrocote coated prints, but when I was 
testing a 
> variety of of different acrylic based coatings with piezo inks I 
found 
> that under dry south window testing the coating improved the fade 
by up 
> to 100%...so this is the opposite of Paul's results with the 
Hydrocote. 
>   Honestly I'm still a bit skeptical of the aliphatic polyurethanes 
> being as good for paper coating as the acrylics...but this is not 
based 
> on actual comparative testing...just my knowledge of the respective 
> chemistries.
> 
> Robert
> 
> 
> On Saturday, August 9, 2003, at 06:35  PM, Paul Roark wrote:
> 
> > jeffmoore17@c... wrote:
> >
> >> 1) Has anyone done any testing on the issue of whether or not 
coating
> >> with a product such as Hydrocote Polyshield affects the archival
> >> properties of Piezography carbon prints?
> >
> > I've fade-tested coated v. non-coated prints.  I assume the MIS 
and 
> > Piezo
> > inks are about the same.  In general, the coated blacks faded a 
bit 
> > faster,
> > although I think that could well be due to the higher dmax 
raising the
> > temperature (by absorbing more light).  The black ink in the test 
was 
> > the
> > MIS VM-K (probably the same as PiezoBW K).  The 50% patches were 
> > generally
> > the same in terms of their fade rates.
> >
> > There was one other situation that seemed to accelerate the 
coated 
> > print
> > fading.  I tested one group under very high humidity conditions.  
(The 
> > test
> > light, etc. were right over a tray of water.)  The coated print 
did 
> > fade
> > faster.  The uncoated prints faded at essentially the same rate 
as the
> > low-humidity tests.  I speculate that the difference could be 
that the 
> > hot
> > light artificially dries the un-coated prints, whereas the 
coating 
> > traps the
> > water around the pigments.
> >
> > In general, we've always been led to believe that high humidity 
> > accelerates
> > fading, but this has never shown up in my tests except for the 
coated
> > prints.  One of the criticisms of accelerated testing is that it
> > artificially dries the inks, with the result that the fade rate 
is 
> > reduced.
> >
> > So, I have 2 test results that seem to favor un-coated prints.  
I'm 
> > very
> > suspicious that both are more artifacts of the testing than 
predictors 
> > of
> > faster fading for PUR-coated prints.
> >
> >> 2) When coating Piezo prints with Hydrocote, after a good curing
> >> period, can these prints be drymounted, i.e., Seal tissue and
> >> drymount press?
> >
> > Yes, I've used Seal Colormount at 180 degrees f.  Be sure to use 
fresh
> > release paper and wait the full 7-day curing period.  Also, with 
> > trimming
> > the prints, a rotary trimmer might be a good idea.  I've noticed 
a bit 
> > of
> > edge roughness when trimming with a straight razor knife.
> >
> > As an aside, one of the PUR experts told me that heat accelerates 
the
> > cross-linking and curing.  Heating the PUR soon after application 
might
> > actually make for stronger coating -- bringing the 
strength/extent of
> > cross-lining of the single-solution, water-borne products close 
to the
> > industrial products.  (The adhesion of a water-borne PUR will 
not, 
> > however,
> > match the solvent-based products.)  This heating information 
suggests 
> > that
> > the use of a hair-drier might not only speed the drying and 
curing, 
> > but also
> > result in a stronger coating.
> >
> > Paul
> > http://www.PaulRoark.com
> >
> >
> >
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