[header] How to bleach dark brown or black hair to platinum blonde or white [title] Check if your hair is healthy enough to withstand bleaching. [step] There is no way to avoid the serious damage to hair that this amount of bleaching incurs. Some stylists won't bleach hair that has already been color-treated or processed. 
Check with your hairdresser in advance to avoid disaster. [title] Set aside an adequate amount of time.