Digital BW, The Print

> 
> Curious - why not Print Shield for matte prints? What does it "do"
> to them?

It lowers the dmax.  Lascaux has the least negative effect on matte dmax of
the sprays I've tested.  (I have 3 more sitting here waiting for testing.)

With glossy paper it is just the opposite.  The Premier Art raises the dmax
more than Lascaux. 

As John notes, the Premier Art spray has a UV filter in it that Lascaux
lacks.  Thus Lascaux has no significant effect on lightfastness.  Premier
Art will generally help the lightfastness.  However, my tests show about a
35% improvement with UC pigments but only about a 10% improvement with MIS
pigments.  (The Premier Art spray takes the UC pigments up to about the same
level as the MIS pigments.)  The MIS pigments almost act as if they already
have a UV filter on them, and, in fact, the "clear" base is a yellowish
color.

So, different types of spray are better for different types of paper.

Paul
www.PaulRoark.com 


> 
> Paul Roark wrote:
> 
> > For glossy prints I use PremierArt Print Shield. For matte prints I use
> > Lascaux Fixativ (see http://www.dickblick.com/zz217/14/ ).
> >
> > Paul
> > www.PaulRoark.com
> >
> >
> > > -----Original Message-----
> > > From: DigitalBlackandWhiteThePrint@yahoogroups.com
> > > [mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] On Behalf Of
> > > Margaret Stratton
> > > Sent: Wednesday, May 25, 2005 1:46 PM
> > > To: DigitalBlackandWhiteThePrint@yahoogroups.com
> > > Subject: Re: [Digital BW] Matte versus glossy dmax: a matter of
> physics?
> > >
> > > Paul,
> > >
> > > What spray are you using on you prints. With MIS ink I assume.
> > >
> > > Thanks
> > > M Stratton
> > >
> > >
> > > On May 25, 2005, at 11:39 AM, Paul Roark wrote:
> > >
> > > > Dave,
> > > >
> > > > I think the best example that shows that the surface reflective
> > > > characteristics are the main differences between matte and glossy
> > > > papers
> > > > with respect to dmax is that an Arches Hot Press, un-coated print
> > > > jumps from
> > > > about 1.5 to 2.5 with multiple coats of, for example, acrylic,
> > > > applied to
> > > > its surface to give it a gloss.
> > > >
> > > > The spectrophotometers we use for measuring dmax use nearly perfect
> > > > lighting
> > > > that avoids the problems of reflections. This gives the glossy
> > > > papers a
> > > > huge advantage.
> > > >
> > > > In the real world, a matte print sitting on my desk top appears to
> > > > have a
> > > > better dmax than a gloss print because the glossy print dmax is
> wiped
> > > > out by
> > > > reflections. That is, the nature of the lighting is what makes all
> > > > the
> > > > difference. If the display conditions are perfect, the glossy prints
> > > > are
> > > > terrific. If the lighting is bad, like a window behind the viewer,
> > > > matte
> > > > wins.
> > > >
> > > > Of course, if one puts glass over matte, you may end up with the
> > > > worst of
> > > > both worlds. So, my favorite is a sprayed Semimatte with no glass.
> > > > But, I
> > > > think both types of prints are important, and being able to print
> > > > either
> > > > matte or glossy is a critical part of any inkset I mix.
> > > >
> > > > Paul
> > > > www.PaulRoark.com
> > > >
> > > >
> > > > > -----Original Message-----
> > > > > From: DigitalBlackandWhiteThePrint@yahoogroups.com
> > > > > [mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] On Behalf Of
> > > > > davelongviews
> > > > > Sent: Wednesday, May 25, 2005 7:29 AM
> > > > > To: DigitalBlackandWhiteThePrint@yahoogroups.com
> > > > > Subject: [Digital BW] Matte versus glossy dmax: a matter of
> physics?
> > > > >
> > > > > There has been a lot of discussion over extended periods on the
> > > > group
> > > > > regarding matte
> > > > > and glossy dmax. Is it true that light SCATTERED at the paper
> > > > surface is
> > > > > what gives a matte
> > > > > surface its look, and that very same scattering is what reduces
> > > > dmax? And
> > > > > with a glossy
> > > > > paper less light is scattered, more is REFLECTED, dmax is greater,
> > > > and you
> > > > > have the
> > > > > glossyness to deal with. In other words isn't it true that you
> > > > can't have
> > > > > a matte surface with
> > > > > a truely large dmax? Aren't paper surface/glossiness and dmax
> > > > directly
> > > > > related in a way we
> > > > > wish they weren't? Is it physically possible to separate the two?
> > > > Any
> > > > > thoughts?
> > > > >
> > > > > Dave
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
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> > > >
> > > Margaret Stratton
> > > Obermann Center Research Scholar
> > > Professor of Art
> > > Department of Art and Art History
> > > Iowa City, IA 52245
> > > www.margaretstratton.com
> > >
> > >
> > > [Non-text portions of this message have been removed]
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> 
> 
> 
> 
> Please visit the Group Homepage to check the Files, and other resources as
> they are often being updated.
> 
> http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint
> 
> If you wish to receive no emails or just a daily digest, or you wish to
> unsubscribe, please edit your Membership preferences by visiting this same
> page.
> 
> Please follow these basic guidelines:
> - As threads develop, trim off excess portions of earlier messages to keep
> them short.
> - Good manners are required at all time. No personal attacks or flames.
> Hostile, aggressive or argumentative users may be removed from the
> membership without notice.
> - Keep your posts and threads related to the group topic of digital B&W
> printing. Users who persistently make off-topic posts may be removed from
> the membership.
> - By posting on this forum you agree to abide by the group rules and
> guidelines, and to abide by the actions and decisions of the group Owner
> and Moderators. See "Group Topic, Rules and Guidelines" in the Files
> section:
> http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint/files/
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> BY PARTICIPATING IN AND/OR POSTING MESSAGES TO THE DIGITAL BW, THE PRINT
> YAHOO! GROUP YOU EXPRESSLY UNDERSTAND AND AGREE THAT THE "OWNER" AND
> "MODERATORS" OF DIGITAL BW, THE PRINT YAHOO GROUP SHALL NOT BE LIABLE TO
> YOU FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL OR
> EXEMPLARY DAMAGES, INCLUDING BUT NOT LIMITED TO, DAMAGES FOR LOSS OF
> PROFITS, GOODWILL, USE, DATA OR OTHER INTANGIBLE LOSSES (EVEN IF THE
> "OWNER" AND "MODERATORS" OF DIGITAL BW, THE PRINT YAHOO GROUP HAVE BEEN
> ADVISED OF THE POSSIBILITY OF SUCH DAMAGES), RESULTING FROM: (i) THE USE
> OR THE INABILITY TO USE THE DIGITAL BW, THE PRINT YAHOO GROUP; (ii)
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> PRINT YAHOO GROUP.
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> 
> 
>