Hi everyone I'm new to this site an qualified to level 3 but haven't been doing hair for a long time. I've cleAnsed my friends hair from a patchy red n it went a 7 base but very ginger she basically wanted the red stripped out n just brown. Well I added a 5/07 permant 6% after and it made it a very light ginger brown a nice colour but not what she wants as she wAnts to be a flat brown like a 4/5 base. I'm asking for advice as I'm going to redo it and should I buy like a 5/0 on it's own in a quasi colour? I'm jus worried it's not going to go how she wAnts and wasting 10 pounds each time on tints.