I’m naturally a redhead although it’s slightly grey/mousier than it used to be. I got a subtle balayage about 3 months back. It was beautiful to start but my whole hair has lightened now- probably a mix of sun/chlorine on holiday. It’s a kind of yellow brassy colour now and horrible. Can I put a box dye over it- I was wanting to do a light brown/red box colour. How will it take on the lightened areas?