so she's one of my regular clients, she always have the whole head highlight (9N blonde) and the base color (7N) done. but this time i think i left the highlight a little too long. when i washed it with purple shampoo, it turned out like a silverish color and then i toned it with 9N. it turns out like a ash blonde which she hates it a lot (she said it looks like grey ). so what can i do to make it back to warm blonde color , i am thinking if i can put kenra 9G with 10vol all over her hair in the sink? please help and share your experience ,thank you