I've got a new client who has been using box colours on her hair for a long time, she;s about a 2 to 3. She want to have some red foils through the top section and a deep brown all over, I really dont want to be bothering with pre lightning the foils then putting the red on, so my question is has anyone used the red majicontrast over a box colour with good results, and did you use a 10 or 20 vol peoxide ?