Whether you’re a beauty novice or a confirmed fashionista, this topic is for consulting Mumsnetters on all things style-related. Plus, check out our Swears By page for the inside track on the next Mumsnet must-have.
Youd need to strip the brown with colour B4 or similar then see what colour you are left with. Probably be orange. Maybe bleach all/highlights to get as near as possible to your natural shade then get a colour lift at a salon. Home stripping/colouring of this nature is fine as long as you have a nice hat for the middle stage (between colour B4 and dying), good condition hair and are prepared to go for the chop if if all goes horribly wrong!
I'm not a hairdresser, I do my hair all the time though. Google Scott Cornwall for good advice.
I would use: Decolour or Decolour Stripper
The former just removes colour to what your natural hair is (this may be lighter or more brassy than you expect due to bleaches in box colours you've used). I've used this and works v well.
Decolour Stripper also uses bleach to lighten your hair. It removes colour and bleaches it lighter.
Then you need a colour. Use a LIGHTER colour than you want as it'll come up much darker. If you can bear to leave it 24 hours in between the decolour and new box this is better.
Choose a colour with Ash in the title to neutralise brassy tones. Also purple shampoos or violet/blue toners are great. If you're going for blonde - purple toner to remove orange, if your hair is brown with red tones you need a blue toner to remove the brass.
Don't use anything that says warm or golden. You want cool or ash. Nice n easy semi permanent colours are great for after decolour - lots of ash tones. Remember at least 2 shades lighter than you want!
If you've got long hair use Colour B4 a much better coverage than Scott Cornwall. Follow the instructions to the letter. You will have an end result of orange hair. DO NOT recolour with a permanent colour because it will reoxidise and go dark again. I'm an ex hairdresser and have removed my hair colour many a time.