Digital BW, The Print

>...
> Ordinary glass will apparently filter approximately 40-45% of UV light.
>...

And that may understate the actual difference between indoor and outdoor
display in terms of fading.  My understanding is that glass is opaque to the
shorter UV wavelengths, and those are the most damaging.  Acrylic apparently
blocks even further up the wavelength scale (and is more colorless than at
least cheap glass).

Paul
www.PaulRoark.com