Hi, what a great community! A new older client has 100% white/some gray hair. Her previous colorist (another state) did a beautiful light blond with some gold lowlights for years. Mix - Wella Kp 99/0 1 oz, 88/0 1/2 oz, 8/0 one inch, 6 % volume. Client did box dyes during covid. With the same kp mix I got a brassy gold tone trying to re establish color base before low lights (or high lights?). Suggestions why this might happen?