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Biologist here, it depends on HOW her hair works.
Does it still actively use the light as its power comes from the sun? And if yes, does the haircolor affect the absorbation of the light?Or is it only important that the hair isnt damaged/destroyed.
Lets just assume it can repair itself to a degree (otherwise stuff like split ends wouldve ended it long ago). How far can that go? Cutting seems to destroy it, so lets assume that for some reason, the hairs act like one big cell that gets destroyed by cutting.
Small attacks to its outer side will propably be able to be repaired, however damage that is done on wide areas will propably not be tolerated.
This brings me to the conclusion that stuff like bleach will destroy her power because of the structural destruction. Same goes for perms.
However, if it is true that the hair does not need to actively use the sun, semi permanent hairdye shouldnt be a problem and permanent hairdye could also be fine as long as youre careful and make sure the damage isnt too intense.
Having my nightly ADHD moment so bear with me:
If Rapunzel were to dye her hair, would the chemicals affect the magical properties of her hair?
This is taking into account the fact that her magic derives from the sun essentially, which then becomes a flower. Taking those chemicals into account, if we were to interact those chemicals with the chemicals of hair dye combined with hair as is, I’m just wondering what the effects would be.
I’m no chemist; in fact I almost failed chemistry. So if someone who knows chemistry could help me out here that’d be great!
EDIT: my discord friends are bringing up great points such as hair damage and how it varies.