-----Original Message-----
From: Paul Roark [mailto:paul.roark@...]
Sent: Monday, March 22, 2004 8:45 PM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: RE: [Digital BW] effect of Print Guard on watercolor papers
Jim,
>What do you think of Lumijet Image Shield?
I don't know what it is. It could be the exact same product. I notice
that
Marshall's has a similar product in a can that is exactly like the
PremierArt and Lyson sprays. Many of these are probably coming out of the
same large chemical company factory.
Paul
www.PaulRoark.com
_________________________
-----Original Message-----
From: Paul Roark [mailto:paul.roark@...]
Sent: Monday, March 22, 2004 8:21 PM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: RE: [Digital BW] effect of Print Guard on watercolor papers
>...should I use Lyson Print Guard on papers like hahnemuhle William
>Turner or Luminos Museum Parchment or Legion Somerset
>enhanced?
Print Guard appears to be the same as PremierArt Print Shield, which has
been tested by Wilhelm. See
http://www.wilhelm-research.com/pdf/WIR_Ep9600_2003_11_01.pdf
Some of the papers were sprayed with PremeirArt, and it appeared to help
the
lightfastness and not affect the paper life estimate to the extent of
the
testing (to >200 years).
>What is the long term effect of Print guard. Does it eventually
>crack or discolor.
These companies are not disclosing what the products are. Solvent based
acrylics have the best reputations for not yellowing, and I assume that
is
what these are. My past research led me to Rohm & Haas's B72 formula as
the
most trusted by conservators. Grumbacher Tuffilm is apparently the same
thing and readily available at art stores.
See the statements of Ross Merrill, Chief of Conservation at the
National
Gallery of Art, Washington D.C. (USA), below. In a 1997 speech
regarding
pastel conservation he said as follows regarding fixatives (which these
are):
"Today there are a number of alternatives. Krylon Acrylic Varnish B72 is
used by conservators. [Krylon no longer makes this, Lascaux Fixativ is
the
only true Rohm & Haas B72 that I know of.] This product will remain
unchanged for 400 years, but does have a tendency to saturate the
surface.
Grumbacher B77 varnish or "tough film" is the same as B72, but will not
saturate..." See <http://www.bmi.net/knapp/iapsmerrill.html>
I prefer the Lyson or PremierArt for glossy prints because it is easier
to
get an even spray. For matte prints the Grumbacher or Lascaux has
worked
fine. Grumbacher is probably the cheapest and most readily available of
the
products. I think it has been used by pastel painters for many years.
Paul
www.PaulRoark.com
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