"Peter Huebner" wrote in message
t...
In article ,
removespamlcb11211
@swbell.net says...

Apparently windshields have some type of filter and or indirect light
does
not affect the finish. Some automatic tenting prescription glasses will
not
darken behind a windshield.


Glass does cut a great deal of UV out of direct sunlight. Alas, not all of
it.
The jarrah inlay in my kitchen table has faded from purple to pale brown
:-(


The angle and thickness may have a lot to do with it also. Sunlight through
a windshield is not as much of a constant as a window glass in a house.