Digital BW, The Print

Mark,

As far as I know exposure to sunlight solves the air (sulphur) 
contamination of (matte) coated papers.
I can imagine a short illuminated revival when the last OBA is burned 
out by sunlight :-) but after that there is nothing left of the OBA 
fluorescent effect.
You should ask Mark McCormick what kind of chemistry is left in the 
paper after OBA degradation and whether he can expose his tested samples 
to sunlight to see what happens. My best guess is that it will not bring 
back the paper white it had when first printed.


On 08/23/2012 10:42 PM, Mark Savoia wrote:
> Will that extreme exposure to sunlight fix it?
>
> Mark
> http://www.stillrivereditions.com
>
> On Aug 23, 2012, at 4:24 PM, Ernst Dinkla wrote:
>
>  > On 08/23/2012 07:50 PM, Ben Schneider wrote:
>  >> I am wondering if it has to do with optical brighteners which are added
>  >> to some papers.
>  >
>  > The Museo Silver Rag has no OBAs.
>  >
>  > I am moving away from Epson Exhibition paper for this
>  >> reason. In test it yellows very quickly.
>  >
>  > Worst tested paper white stability at Aardenburg, counting all papers
>  > there, including RC papers. The OBAs not only loose their function but
>  > yellow themselves so the yellowing goes beyond the "natural" paper white
>  > of a paper.
>  >
>  >
>  > --
>  > Met vriendelijke groet, Ernst



-- 
Met vriendelijke groet, Ernst

Dinkla Grafische Techniek
Quad, pi\ufffdzografie, gicl\ufffde
www.pigment-print.com