Well here’s what’s goin on... she had her hair bleached all over from a different stylist and it is super brassy. She wants to be more ashy and is considering partial balayage as well. I would need to tone the brass, balayage and tone again. I just thought it wouldn’t matter if I tone and bleach at the same time. I’ve see. Stylists do shadow root the same time as the bleach application.
Id be inclined to do a full head scattering of highlights, while these are processing, apply a demi/quasi in between to bring the base down to at least a 6. Then once this is processed, rinse, shodow the root with a 5 again depending on how dark your client really wants to go, and then apply a toner over the mid lengths and ends, that is going to clean up the highlights, blending the two together.