To me thsi is the worst thing you can do , see if you go over the brown like ive actually done it will go yellow or could even go green , keep having it cut and keep washing it maybe when there is only a little left you could try some hi lites and gradually build it back to blonde, it is also bad for your haiir if the brown is also a permament clour, the bleach strips the hair so if you real:angel::angel::angel:ly have to do it you might find that you have to do it twice and keep it in really very good condition lots of luck fromkatxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxx