how do you dye your hair white?
It isn't something you'd want to do yourself, that's for sure. You'll need to go to a salon. I knew someone who used to just bleach their hair to blonde, and it got so frail she lost so much hair and then had to wear a wig. White seems like it would be even harder on your hair.
If you are naturally a very light blonde to begin with, it might not be much of a problem for a stylist to do. If your hair leans more towards the black, it might be impossible, no matter what.
you need to get your hair profesionally blached to death at a salon bleaching destroys your hairs health, strength and shine and to make hair white it requires a lot of bleaching which will inevitably damage your hair then you need to buy a good white hair dye, like one from manic panic and use that then youll need to take care of it because white isnt an easy colour to keep
Get it done by somebody who knows what they are doing. If they don't have white then get it bleached blonde so it looks white or dye it grey because that is kool too.
Why do you want to die your hair white, that would look silly
Avoid henna based dyes, they will turn it pink!