A Year by the Window (updated for 5/23/21)

So this is an experiment I started a year ago on this date. I purchased a Proof 1961 Roosevelt, no cameo and originally blast white, and decided to set it by a south-facing window to see if and how it tones. For under $4.00, it was neat to see how the coin changed color over the year.
February 18, 2020
May 23, 2020. Purchased a second proof at the time for comparison.
June 11, 2020
August 20, 2020
December 17, 2020
February 18, 2021 - One year later.
Thanks for checking out my post!
Update..
May 23, 2021. I'm beginning to think that toning colors might be seasonal.
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Comments
Probably should have saved the Roosie last June. Going quickly toward terminal.
@The_Dinosaur_Man You always left it obverse up? Is the reverse still blast white if that is the case?
I hardly touched the coin once I put it there, so the reverse should still be white
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That is so cool.
I like the one from June 11.
Neat! Roosevelt got a tan from the sun.
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--- If it should happen I die and leave this world and you want to remember me. Please only remember my opening Sig Line.Wow interesting! Good job. Just remember its AT since you did it intentionally
I have some state quarters still in mint packaging. One set is a light blue ring. The other has two light rainbows. Set them by the shades near a big window. They will head in for grading eventually.
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A very interesting experiment!
I agree with others that the outcome went downhill after June.
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What happened to the other side?
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