I saw this leaf while I was out running and thought it was a good one. I put it carefully in the pocket of my shorts for the last 6k of my run. I was skeptical it would make it home in good shape, but surprisingly it did. I decided to try a black background this time.
Part of the reason for the color change is that the tree pulls the useful components of the green chlorophyll out of the leaves so it's not wasted when it drops them. Yellows and oranges were there all along and are uncovered when the green is gone. Red on the other hand is actively produced in the autumn, making it more variable.
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