My client tomorrow has currently home coloured her hair, roots around a 5/75 and mid lengths, ends a level 5. She is wanting to go to a level 3 with slices of red. Was going to use Majicontrast Magenta red. Will this work on artificial colour or would I have to prelighten to a orange/yellow first. Also if I prelightened and the red fades quickly I am worried what colour she will be left with? Thanks for any help in advance