I have just had a full head of 9 and white blonde foils over a disasterous lightening experience that left me yellow. Problem was I already had ash blonde/light brown regrowth so the foils didn’t cover them and it was toned but the unfoiled yellow came screaming back a week later. So I went for a L’Oreal Excellence 8.1 Ash blonde to go closer to my roots and the ash to take away the brassiness ( let’s face it, it was yellow) .
I decided to go for 30 mins developing time once I’d finished applying to roots and lengths. Upon checking at the 20 min mark I decided it was dark enough and I washed it off. This is chemistry ladies, you can’t just sit there and not check your hair, there’s a lot of people complaining their result was too dark, you have to use some smarts and be your own hairdresser.
Does your hairdresser check your colour and decide it’s time? Yes. Anyway, It is brilliant. Still bright and blondy but not brassy or patchworky like it was. I can go out in public again! Next time I am going for the 9.1 light ash blonde cos colours build up and go darker.