Digital BW, The Print

Op 2-1-2011 17:54, Paul schreef:

> By the way, there is another combination of spraying that should be
> tested.  The Print Shield has a very volatile base that evaporates so
> quickly that in some hot dry places it hits the paper as hard little
> balls.  This very volatile base appears to cause it to, relatively,
> sit on the surface as opposed to soaking in and surrounding the
> carbon particles and paper base (or coating).
>
> Before a large company's threats drove Livick's fade testing off the
> web, he appeared to find that a combination of the lighter, less
> volatile Lascaux Fixativ applied first, and then the UV containing
> Print Shield second improved lightfastness.
>
> Whether this was due to the different characteristics of the sprays
> or just because it resulted in a thicker coat is uncertain.
>
> It appears there are somewhat better fade results with the water
> based UV Eco coating from Premier Art than with the solvent based
> Print Shield, probably due to the thickness of the coat.  A Golden
> paints tech once told me that, all else being equal (thickness,
> amount of UV component, etc.) the solvent based products are more
> effective.  The water borne ones are like "gooey golf balls," with
> gaps between them that do not fill in all that well.

> Paul www.PaulRoark.com


There are doubts whether UV blocking is possible with the thin layers as 
produced by for example Print Shield. Much more likely gas fading of any 
kind is blocked by the varnish.

Water based varnishes are usually dispersed acrylics and it is in their 
nature that they have more difficulty to form continuous layers. even 
harder when the layers are thin. But on canvas with thicker layers the 
encapsulation should be perfect.

I have used a Talens varnish 680 that is slow in drying, kind of white 
spirit based and the prints keep that smell for a long time. On for 
example HP Matte Litho Realistic the matt surface isn't changed much. 
Toxic as well though.


-- 
Met vriendelijke groeten,   Ernst

Try: http://tech.groups.yahoo.com/group/Wide_Inkjet_Printers/

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