Digital BW, The Print

Paul,

Thanks for some hard data on the Photo Rag. A lot of people, including
myself, seem to have gravitated to it. All the MIS VM curves that you have
done for EAM seem to work very well on Photo Rag and other Hanhemuhle papers
as well.

I think the LPM is about the brightest paper out there so the OBA content
must be pretty high which probably explains the faster yellowing.

Martin

----- Original Message -----
From: "Paul Roark" <paul.roark@...>
To: "DigitalB&WPrint" <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Monday, February 25, 2002 9:35 AM
Subject: Re: [Digital BW] PhotoRag 308 turning yellow


> >PhotoRag has optical brighteners in it...so it will eventually turn
yellow
> >if left in light.  ...
>
> I have not been following all of this thread, so please excuse me if this
is
> out in left field.
>
> I fade tested some Hahnemuhle German Etching paper.  I think I was once
told
> these papers use the same coating. If so, the yellowing I saw may be the
> same as what the PhotoRag would experience.
>
> After 500 hours in the florescent light fader (well beyond where most
> yellowing occurs and then stops), the X-Rite spectrophotometer shows 0.01
> unit density increase in yellow.  This is half what EAM experienced in the
> same time and test.
>
> The specific numbers are as follows (in order: cyan, magenta, yellow,
> visual):
>
> Hahnemuhle German Etching:
>
> Control: 0.02, 0.03, 0.04, 0.02+ (2 of 3 readings at 0.02),
> 500 Hr: 0.02, 0.03, 0.05, 0.03;
>
> Epson Archival Matte:
>
> Control: 0.04, 0.04, 0.03, 0.04
> 500 Hr: 0.04, 0.04, 0.05, 0.04.
>
>
> While the EAM is quite visibly yellowed, the Hahnemuhle paper is what I'd
> call slightly yellowed.  I'm not sure that one would see the differences
in
> the Hahnemuhle paper if a new and "yellowed" print were under glass on
> display and separated by a reasonable amount.
>
> For comparison, check out this Legion Photo Matte after 300 hours:
>
> Control: 0.05+, 0.05, 0.01, 0.05
> 300 Hr: 0.05, 0.05, 0.04+, 0.05.
>
> Paul
> http://www.PaulRoark.com
>