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PLEASE PLEASE PLEASE do NOT bleach it or use ANY kind of light colour. Blonde hair colour will still have peroxide in it, even if it is a small amount.

As you've been blonde your hair is more porous, therefore your hair grabs colour more, but also lets go of it quicker (i.e fades). Theres no real way to get rid of the black. Yes you can go to a salon and have the colour stripped but your hair will be RUINED. Your hair will more than likely go an orangey/orange brown colour, so then you will have to cover it with another colour, and as your hair is so damaged, it will be more porous, therefore colour will fade, and you'll be back to square one.

How long ago did you dye it? If you did it less than a week ago you should be able to strip it out with washing out liquid. Well, not strip entirely, but it will fade the black. Really really scrub at your hair and it will bring the colour out a bit. Its hard to say what colour it will go to, but more than likely it'll fade out to a dark brown colour. Anymore than a week then its more than likely your hair has taken the colour and it'll fade out like any other colour.

In all honesty... I hate to make it sound rubbish, but theres not a lot you can really do. I work in a hairdressers & we have so many people come in asking for us to strip out the black or asking what to do with it to get it lighter and there isn't a whole lot.

I've made the mistake of dying my hair black and it looked horrific. I just waited for it to come out. You either get it stripped out and ruin your hair and cause your hair much more long term hassle/problems by your hair being EXTREMELY damaged, or you wait it out and scrub it with washing up liquid. Also stripping it out can be very expensive as its usually more than one application. We charge at my work on average £50 (just over $100) per application.

But yeah... sorry for the long post, my overall suggestion is use washing up liquid. Hope that helps