i have a client who currently has 30% white hair and a natural base 5. i currently use wella kp 5/0 + 5/07 so its fairly dark. she wants to go to wella kp 55/66. i am thinking bleach bath to remove dark tones on ends, then 55/66+5/0+0/66 on roots 6%, then the ends i would like opinions please to...