Getting rid of black hair

I used colour b4 to get rid of my black hair. It worked really well.

First off, is your hair dyed black with a semi-permanent dye or a permanent dye?  (If you had to mix two bottles together then it's a permanent, even if it's a box from the drugstore that said semi-permanent on it) 
Your best bet is to remove the colour pigments first, then see what sort of base you're left with.  If it's a permanent dye, then it will have lifted your base colour before depositing the darker colour onto your hair.  So get yourself some Scott Cornwall decolour remover (not the stripper), and use that first of all.  If your black dye is heavily built up, you can use decolour up to 3 times before it's done all it's going to do. 

Once you can see what base you're left with, you can then decide how to proceed.  Firstly, you'll need to deep condition after the decolour.  It isn't damaging, but it can dry out your hair.  Then give it a good week or so before attempting anything else.  If you use anything with peroxide in it just after a decolour, the colour molecules can re-oxidize, causing you to go straight back to dark.

So now that you've waited a week (and washed thoroughly & deep conditioned during that week), you'll want to get some bleach powder, peroxide, clarifying shampoo, coconut oil, and joico k-pak deep penetrating reconstructor.

A bleach bath is essentially weak bleach.  You mix up the bleach as you usually would, then dilute half and half with clarifying shampoo.  This will lift your hair by about 2-3 levels each time, and you can use these once a week (provided your hair remains in good condition, and with the joico in between) until you reach your desired level of colour.  There's a tutorial here:  http://www.hairdyeforum.com/index.php?topic=995.0

So step one is to assess the condition of your hair.  Do this by washing with clarifying shampoo, no conditioner, then let your hair air dry.  This will let you see the true condition of your hair, and assess whether or not it's strong enough to take bleaching or bleach bathing.

Step two (provided your hair is strong enough) is to soak your hair in coconut oil for a good few hours (see this thread: http://www.hairdyeforum.com/index.php?topic=3806.0

Step three is to apply your bleach bath straight over top of the coconut oil (don't wash it out).

Then repeat weekly until you reach your desired level of lift.

There's also a thread here: http://www.hairdyeforum.com/index.php?topic=8287.0 and here: http://www.hairdyeforum.com/index.php?topic=1734.0   with lots of useful tips & info.

its permanent but its the xxl live deep black which ive heard is hard to get off :/
why not the stripper?
that's really helpful though. I don't get paid till 1st august so im just trying to fade it more at the moment. x

Live xxl can be difficult to get rid of if you use high heat styling (ie: straighteners), as it contains silicones which can boil into the hair with high heats, making the colour molecules impossible to remove.  If you don't use high heat (over 200 degrees), then it should be fine to come out just like any other permanent dye.

The reason why you don't want the stripper is that it contains peroxide so is a form of bleach.  The remover will just remove the deposits of dye on your hair, without bleaching at all.  This will allow you to see what base you're left with, and probably enable you to lighten with less bleaching, so less damage.  If you start off with the stripper, you won't be able to determine your actual base colour under the dye, and will probably end up bleaching more than you need to.

ace thanks :]
im reading up reviews on it and the colour before I used years ago stank of rotten eggs. is there any way of getting rid of that smell at all lol. unfortunately I have to work close up with the public haha

It seems to be a feature of colour removers, although the scott cornwall decolour has a different smell to the colour B4 (as in not rotten eggs, but still not pleasant).  I think the best thing to do to get rid of it is to wash your hair a good few times straight afterward (which will help with rinsing out the colour molecules too), and wash a few times in the week in between doing the remover and the first bleach bath. 

I may have to re read the bleach bath thing, ive got some of the Jerome Russell? bleaching kit. brought it when I was blonde few years back.
I don't want to go blonde or that light again  but I will look in to more. :]
thanks

Mindi's advice is spot on, that's going to be the safest, most effective, least damaging way to get to blonde. When I went from permanent black to blonde (which I posted photos of in my timeline in the show off section if you're interested)  that's pretty much the same way I went about it + it worked out great. Definitely stick with a color remover though and not a stripper, they are basically bleach. There's Decolour Remover, Provoke, Bo Jazz/Jo Bazz (sorry, always get the name confused lol), Colour B4, Color Oops, One n Only Colorfix, Pravana, etc.

Can I do a bleach Bath after a colour remover?

Not directly after no - you should leave it a week or a few washes at least before you bleach (or use a box dye) because otherwise the colour can reoxidise and come back, so you can end up with the same colour you had before the treatment.