Digital BW, The Print

> Premium Luster 250 (OBA's and RC) rated 71 years under glass, 165  
> under UV, 48 with bare bulb and >200 in dark storage.
> 
> Photo Rag Pearl (no OBA and Rag) rated 64 years under glass, 126  
> under UV, 35 with bare bulb and >200 in dark storage.
> 
> With the recent discussions on OBAs and paper bases, how is it  
> possible for Premium Luster to last longer? Not only that but:
> 
> Fine Art Pearl (OBA's and Rag) rated 82 years under glass, 148 under  
> UV, 46 with bare bulb and >200 in dark storage.
> 
> So of the two Hahnemuhle papers, the one with OBAs outlasts the  
> "purer" paper.
> 
> Am I misunderstanding something?

I don't think the OBAs is the significant difference between the
papers.  I've had Harman FB Al in a south facing window since last
summer and the paper base has moved from cool to neutral but doesn't
seem to have other negative effects.

You can see this site (blue files are downloadable for free):
http://aardenburg-imaging.com/cgi-bin/mrk/_4102c2hvd19kb2NfbGlzdC80

Any look at the paper white patches as they get bombarded under UV light.

There is also a free 1 hour discussion of image permanence with
Wilhelm here: http://www.luminous-landscape.com/videos/wilhelm-audio.shtml

I'm listening to it now.