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When it comes to unwanted color results – like grayish-purple tones in this case – it’s unfortunately a bit difficult for us to give a completely precise recommendation without seeing your hair and knowing more about both the starting point and hair quality.
To achieve the result you desire – a slightly warmer, «dirty blonde» shade – we would definitely recommend that you visit a hairdresser. A professional will be able to assess your hair on-site and adjust both color and treatment to achieve the right tone without damaging the hair.