color correction

Hi guys, so I had a client today who wanted to try something new.. she's 90% grey and wanted some red highlights on top (literally a scattered few) she now has decided she doesn't like it with the grey and wants to go for an all over blonde. So like an 8 level. I used 77/46 for her highlights...

I have a new client with fine hair. She hadn't coloured her hair for 18 months after a chemical cut. Most of the damaged hair had been cut off. She wanted to go back blonde and went to a salon, they gave her a full head of baby highlights, lots of them but SUPER fine. She now has a dull, dirty...

Hello, any suggestions on how I can color correct this? I want to use Olaplex #1 in Joico Vero K-Pak Creme lightener with the lowest amount of developer possible. I'm thinking it would be best to bleach the yellow section first, and then the roots separately. Not sure what volume I should use...