helpneeded

Hi I've not done hair in quite a while just family so I'm really in need of a refresh on colour theory to reassure myself before i do this hair. She's been having highlights with 6% and a 10.21 toner which has been beautiful for 2 years. However, she's now salt and pepper in the back (the...

Name says it all . Can anyone advise me if there is anything that I can actually do ? Ok long one Back story - client came December, loved her hair, purple balayage , then came back February for same and hair didn’t do what was supposed to do this time. (More bluey purple than purple, she...