How long do I have to use the Tuning Shampoo to obtain a visible result?

That depends on the condition of your hair and its share of grey hairs. Leave the shampoo on for about 2–5 minutes, and then rinse out. The Colour Effect and caffeine penetration improve with longer residence time. As a result, the Colour Effect only becomes apparent with regular application and washes out gradually with normal shampoo.

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