QTR-Quadtone RIP

On 03/19/2011 06:11 AM, piezobw wrote:
> Paul,

> But, I think Mark probably is testing examples on both pigment and dye with UV sprays, and if he reads this list can answer with some authority on the subject.
>
> Best,
>
> Jon

Mark still considers the gas blocking of varnishes (and possibly gloss 
enhancers) as the likely reason for extended longevity and not a UV 
filter in the varnish. Too thin a layer for real UV blocking. On canvas 
layers like that are usually thickers so the UV filter could work there.

Whether the gas block does anything with carbon, semi-carbon or other 
B&W inks is another question. Papers that contain FBA should in theory 
benefit too as the FBAs are in essence dyes more gas fading prone next 
to their UV degradation. One should look into the detail of Aardenburg 
reports which patches exactly are shifting and the direction of the 
shift. Usually paper white gives more white reflectance after the first 
hours of exposure before shifting to the wrong direction (if ever). Not 
a bad shift as it is limited. As I understand from another remark by 
Mark the paper/coating dries in the frame and causes that first effect 
of more reflectance. That effect is however considered a fading shift in 
the end results.


-- 
Met vriendelijke groeten,   Ernst

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

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