Digital BW, The Print

>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