Well I’m not sure if I’m clear here but as mentioned my hair is dark brown, but in the summer the sun just lightens it a lot to pretty much blonde. Not all of it but maybe 50% of it. All winter the hair is all dark brown, so I’m just confused as to how the sun could lighten the hair but also lighten the root which is under the skin. To me that should be no different with just the top lighter. Because if what you’re saying is true, then that would mean those carbon dyes you see people sell to “dye” the root to make laser more effective would work. It would mean people with blonde hair just need to dye their hair black to do laser if you’re saying the root changes too.
I’ll put a hair out that’s blonde and brown and compare the root.