Digital BW, The Print

Paul Roark wrote:
>> ...
>> 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 

350 Nm is roughly were UV light is cut off by normal window 
glass so a small portion goes through. In the past there have 
been numbers mentioned like 15% for its contribution to light 
fading indoors, nothing higher.

And it is correct that better UV blocking will influence the 
color of the prints as well, especially when some fluorescence 
in ink and paper plays a role in the original color control of 
the print.

Ernst

-- 

                    --
           Ernst Dinkla


www.pigment-print.com
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