For a while I thought that the sun lightened my hair a bit, because I used to think of myself as having brown hair, and now I feel like it's more blond. I find it hard to compare though, because the variability in lighting is often (at least for me) a much greater factor than any sun bleaching. Not just the ambient lighting, but the angle of the hair relative to the camera / light. One of the reasons the roots look darker even on non-bleached hair is that they simply scatter less light towards the camera.
Here's what I mean:
I believe this is just (or mostly) caused by the lighting. I have a before/after picture in my album, where my hair looks lighter "after" (which is also after moving to a warmer country), but the "before" picture was taken with the sun a bit lower in the sky.
I will try to take a picture of my ends next to my roots (but not today because my roots are too dirty ).
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