Black to blonde.

damage is inevetable even getting it profesionally done will still leave you with damage to get black hair blonde you need to bleach it and you need to bleach it more than once, and sometimes more than 2-3 times bleach damages your hair it burns it and while it does that it weakens your hair it wont be anywere near as healthy, shiny, thick and strong as it would be if you dont bleach it the damage done from bleaching is usually permanent but not so bad if you use regular protein treatments and masks, ect to keep it relatively healthy

even a professional can’t go that extreme in one dye-job though

I would get it done by a professional. that would be the only way to go extreme like that without damaging it.

in all honesty.. there isn’t a way to do that.. any time you dye your hair, you’re risking damage.. and going from black to blonde in one quick motion doesn’t happen.. I wish I could tell you different :(.. .my suggestion.. go a little lighter at a time.. since you’re at black now, try dark brown.. then wait a month or so and go a lighter shade.. keep up the same thing atleast a month apart, maybe more depending on the thickness of your hair (for finer hair I suggest waiting longer due to breakage issues).. eventually you’ll get to blonde.. but if you just bleach your hair right now, it’ll turn an awful orange color.

Grrr.