Digital BW, The Print

ALL pigmented ink printing papers use a microporous coating that is obviously open to atmospheric contamination. This is why Charles Berger of UltraStable systems was advocating his thin laminating film for use on paper and canvas. Also, Jon Cone used to spray all his art prints with a proprietary protective spray, to enhance his blacks, and also to seal the coating surface.

If you seal the print behind glass, this type of "yellowing" also seems to be held at bay.

I believe Wilhelm did some testing using Premier spray and found beneficial effects--
http://www.wilhelm-research.com/pip/Premier_WIR_2009_03_03.pdf

John Nollendorfs

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "tboleyyh" <tyler@...> wrote:
>
> I'd hasten to add, I've seen the same thing happen on German Etching, William Turner, Somerset Enhanced (or whatever they call it now), and some cheap Epson matte that was tossed in with the printer. I have no doubt it could show up on other coated matte materials. But they haven't been around long enough for stories to appear.
> The HPR stories abound, quite possibly, because of the popularity of the paper as Mark suggested, but the horror stories out there are worrying and imply higher HPR sensitivity. It's more the batch problems, implying inconsistent starting points, incomparable black points, etc, along with the high contamination potential, that bugs me.
> What if there is initial contamination of the paper maybe from shipping, causing inaccurate initial color data, that then cleans up during testing because of UV? But if I have anything to offer to the comparison samples batch, I'll use it if that's the consensus. Ditto on the Silver Rag suggestion, it's looking good in Mark's initial testing there.
> 
> Tyler
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, C D Tobie <CDTobie@> wrote:
> >
> > 
> > On Dec 7, 2009, at 7:54 AM, Mark wrote:
> > 
> > > The severe discoloration problem has been witnessed and reported on  
> > > HPR the most, but that anecdotal experience can be in part if not  
> > > entirely explained by the popularity of this matte paper.
> > 
> > My most dramatic example of this was during the Anthrax scare, when  
> > mail passing through certain mail centers was have certain undisclosed  
> > safety precautions applied to it. I received a fine art matte paper  
> > profiling target print (don't recall if it was HPR, but there was a  
> > lot of HPR being used at that time) from a customer, only to find it  
> > was a surprisingly bright yellow. I requested a replacement target be  
> > FedExed to me, and that one came through the expected white tone. I  
> > believe the process in question may have been intense UV light applied  
> > to kill Anthrax spores, though it could have been a gas of some type.
> > 
> > C. David Tobie
> > Global Product Technology Manager
> > Digital Imaging & Home Theater
> > CDTobie@
> > 
> > 
> >   ----------
> > 
> > 
> > 
> > Datacolor
> > www.datacolor.com/Spyder3
> > 
> > 
> > 
> > 
> > 
> > [Non-text portions of this message have been removed]
> >
>