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How long can you leave Fanola in?

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Depending on how porous your hair is, and how brassy, you should leave it only between 1 and 5 minutes. It is not a purple shampoo to use every day, unless you want to turn your hair purple. This shampoo works best on hair or highlights that has been bleached to level 8 to 10, and it's showing brassiness.
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