Can you retrobright using only the sun?

I've seen some discussions about retrobrighting using only the sun - no chemicals, no tubs, no UV LEDs - just the sun, and I wanted to put that to the test. Join me as we experiment with nothing more than a keyboard and the great outdoors! 6 month update video here:    • Retrobrighting using the sun - 6 month update   #retrobright #retr0bright #vintagecomputing #macintosh