Digital BW, The Print

> Is there a more, for all practicle purposes, a worse scenario than
> direct sunshine?

One problem with direct sun is that it might not be representative of indoor
display.  Even window glass filters out the worst (shortest wavelength) UV,
and that UV may have qualitatively different effects on some dyes and
pigments than visible & indoor light.  It also exaggerates the usefulness of
UV sprays for indoor display. 

I think one has to look at all of these tests and just use good judgment as
to how much to draw from each.  The more tests the better.  No accelerated
fade test is going to be totally valid for any display condition, but it's
nice when we see relative performances that are similar across a range of
different tests and are consistent with our general understanding of the
processes that are going on.  

Keep those informal south window tests coming.  

Note that even the selenium toned silver print is not holding up all that
well.  Nothing is forever.  It turns out the selenium toning most of us were
doing was only a partial tone.  They are fading, and the non-buffered paper
is becoming acidic.  As for me, I'll stick to my "carbon on cotton" mantra.

Paul
www.PaulRoark.com