Digital BW, The Print

Tom Baker wrote:

> Paul wrote:   "...It surprises me that even under UV glass the spray 
> would add that much."
>
> At least the high end uv glasses claim 99+% uv blockage.  So, how 
> could the expected life of the print be doubled by spraying?  
> Something doesn't seem to add up here.
>
> Tom Baker

Because it's not just about UV. The coating seals the front of the print 
slowing down airborn pollutants from worming their way through the inks 
and into the substrate.

Think about it. One of the joys of darkroom photopaper is that layer of 
gelatin on the top that seals the print. The spray provides a similar 
(in a way) kind of seal.