Digital BW, The Print

That's right. He told us here that it is the blue spectrum that
actually does most of the damage, not the uv, because the blue
spectrum is much larger in total output.



--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul Roark"
<paul.roark@...> wrote:
>
> In an art catalog I saw another set of "tests" that tended to show
dyes were
> almost as good as pigments when they were sprayed with a UV spray. 
However,
> when I read the fine print, the trick used became clear.  They had
coated
> the dye test strip with a UV blocking subtance, and the pigments were
> totally un-protected.  Then they used only UV light for the fading.  Of
> course, the UV blocker was essentially opaque to the UV light,
whereas the
> pigs got a full dose of very damaging UV.  Using UV light as the
test source
> terribly skewed the results.  As Wilhelm has noted, in indoor
display, it is
> visible light (assuming no serious airborne pollutants) that does the
> fading.
> 
> Paul
> www.PaulRoark.com
>