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Your client has come in with dingy, greenish, muddy color and has explained that she tried to go back to her natural hair color from blonde to a level 6 .....why has her hair turned this color and what is used to cancel out the color?
The hair turned a greenish color most likely because she used a ash color on top of her blonde and the hair is missing more than just blue, its missing red and orange as well.....using a red base color or gold will help to cancel out the color however, cannot guarentee anything because she used box color.