I wonder if folks are remembering correctly that Dr. Gaddy concluded that sunlight
did not affect colors, or perhaps just that it was undetectable in his experience and/or insignificant in his opinion, especially in contrast to handling/abrasion.
I wonder how extensively he studied light fade? Do you suppose he left a variety of colored pieces exposed to sunlight for 20, 30, 40 years? Or did he develop an accelerated fade test? I know Eastman Kodak Co. spent considerable money and brain power developing tests that would, over the course of a couple of weeks, predict the longterm dark and light stability of its dyes. Of course, you need to establish a baseline of real-time fade before you can create an artificial test. So, If Dr. Gaddy believed there was zero fade, he couldn't very well develop an accelerated test.
Perhaps someone will chime in with a reference to his own words.
If someone started now...put a piece on the window ledge and a piece in a drawer, some of us might live long enough to have the answer.
