-----Original Message-----
From: islandbuck2 [mailto:islandbuck@...]
Sent: Thursday, December 18, 2003 4:09 AM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: Re: [Digital BW] Lyson Print Guard
That's kind of a shame for me. I have made a sizable investment in
time and materials with the current UT work flow for the 1280. I
wish I could consume what I have and then make the switch at a more
economically feasible time. Hey, we all appreciate the time an
effort you dedicate to this! Thanks, Jorge
--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul Roark"
<paul.roark@v...> wrote:
>
> >Paul, will you be making UT curves for the 1280 and some RC papers
> >like Premium Semi-Gloss?
>
> I'll be making UT-2 Semi-gloss curves. (And/or maybe slider setting
> recommendations.) One of the changes was to give better barrier
paper
> performance.
>
> Paul
> www.PaulRoark.com
> ________________________________
>
>
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul Roark"
> <paul.roark@v...> wrote:
> > John,
> >
> > >It looks like PremierArt Printshield is being proposed as a
> > >spray for papers like Epson Semi-Gloss to eliminate bronzing.
> > >Sounds good. You get a glossy print with good dmax and no
> > >bronzing and a protective surface.
> >
> > Yes, add to this a Wilhelm dark storage life of over 200 years,
and
> it makes
> > an interesting package.
> >
> > >But with EEM and the like, the Mayer rod with polyurethane seems
> > >to give the same results. And even though it's a little more
> > >involved than the spray can, EEM is WAY cheaper than glossy
papers.
> >
> > EEM is acidic, having a dark storage life of 110 years, according
> to Wilhelm
> > -- and that is under ideal conditions. When acidic materials
have
> been
> > encapsulated, they have in some tests deteriorated 10 times as
> fast. If the
> > acidic H+ ions are cannot escape, they will have nothing to do
but
> attack
> > the un-buffered EEM paper. So, to get an equivalent life, you'd
> have to go
> > with a buffered cotton paper. The price comparison is then not
as
> good.
> >
> > >So why use the RC paper with Printsheild approach?
> >
> > There are a number of reasons.
> >
> > One is the existence of the Wilhelm tests of the PremierArt
spray.
> I don't
> > have one for the polyurethane coating I was doing.
> >
> > I was not able to scale up the Mayer rod. Some claim to have been
> > successful with 16x20, but I never saw one. I would have gone to
a
> thicker
> > glass and continued to try if I had not been intrigued by the
> barrier
> > papers. So, one reason is that I think I'll be able to scale
this
> process
> > up to any size.
> >
> > I think the carbon pigment may be best protected if it is entirely
> > encapsulated. In my high humidity fade tests, the polyurethane
> coated test
> > strip did worse than one that was not coated. I think the reason
> is that
> > humidity was getting into the print from the back and then was
not
> dried out
> > the way the non-coated test strip was.
> >
> > I am most impressed with the solvent based coatings in terms of
> their
> > ability to surround the particles and protect them. The solvent
> based
> > materials are in liquid form when they hit the pigments. The
liquid
> > surrounds the particle and then hardens. The water borne
materials
> just lay
> > on top. It appears to be the difference between water-based
paint
> and
> > oil-based. The later soak in and stick better. The solvent
based
> sprays
> > are going to do a better job of encapsulating the pigment
particles,
> > protecting them from the environment, and sticking them to the
> paper. A
> > tech person with one of the acrylic companies also said that the
> > solvent-based UV protective sprays are much more effective at UV
> protection
> > than the water-borne materials.
> >
> > With the 4000, we'll be able to go with either paper easily. I'm
> not
> > abandoning the matte papers, but it is time to optimize the B&W
> systems for
> > both now.
> >
> > The barrier (RC) papers may be the easiest, least capital-
intensive
> way to
> > get very durable, high dynamic range display prints. At least it
> is worth
> > exploring.
> >
> > Paul
> > www.PaulRoark.com
>
>
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