Digital BW, The Print

Hello Roger,

>In the Aardenburg tests, for each file (click on the free blue ones)
>it has text at the beginning explaining light levels vs WIR years

Great chart, thanks for the link.

Speaking of Aardenburg, I received an email from someone there today
who, after confirming the calculation of 5 WIR years, added this:

"Now, WIR uses fluorescent lamps in testing, so you've got 
considerably higher UVB and UVa content since you are using natural
daylight and no glass filter. That means you may have a harsher test 
by a factor of 2-5. So your test may be roughly comparable to a 10-
25 years of display via WIR method. That said, the difference in
spectra may accelerate some components more than others. Additionally,
your samples probably got a lot hotter during the illumination cycle
than would occur under normal indoor display, and high temperatures
strongly desiccate prints even when they are in an otherwise humid 
environment. Often, said desiccation will slow reactions that depend
on water as one of the reacting species (a lot of common hydrolysis
reactions for photographic and paper products)."


Regards,
Clayton


Info on black and white digital printing at    
http://www.cjcom.net/digiprnarts.htm
I-Trak 2.1   http://www.cjcom.net/itrak.htm