I have naturally dark hair with quite a lot of blonde highlights/colour through it. My roots are horrendous but I can't afford to get it done again any time soon. The blonde has also gone very orange and brassy in colour. My hairdresser mentioned something about a purple toner or shampoo that could help counter this? Which one should I use? Does anyone have any recommendations? I'm going out at the weekend and just need something to pick me up a bit.