Had a full head of blonde highlights a week ago. After the hairdresser washed and dried it, she noticed one side of my hair was quite a warm yellowy blonde and the rest was an ashy blonde. She pointed it out before I even noticed it and she asked me to return two days later so she could correct it. I had an evening appointment so the lighting wasn’t great. Thought it was all sorted but it’s still really bugging me, there are so many warm yellowy blonde patches and it’s noticeable because the rest is such an ashy colour but I really don’t want to go back again. I was sat in the salon chair for 7 hours in one week and I don’t want more bleach on it as it’s already feeling dry now. I have some olaplex purple shampoo. Can I use this on the yellowy parts now, one week after being in the salon? Or should I wait a while?