I have box coloured my hair for years and today I wanted to prelighten my dark brown hair and apply a medium warm brown... As lately my roots are darker than ends and midlenghts but it's gone as the title says yellow roots and orange ends, I popped it on mid lengths and ends for 20min then onto roots again for 20 mins as the box instructed!!! It's bank hol Monday tmra so no wher open to correct my mess I have popped over from the nail geeks and have clients all day tues can't be seen like this (( please any advice guys please please please waaaa ahaaaa whaaaaa xx