Help.. I'm doing a family members hair tomorrow, I'm newly qualified and just need a little advice, her natural hair is around a base 5. But she has her hair platinum blond, I've previously used a wella koleston 12/1 special blond.. With 2:1 40vol but it has turned her roots kind of yellow/orange.. Her roots have came through again and I'm just wondering what I could do to make it a nice light blond evenly all over. Any help would be great as I'm in a big panic xx