no,it's not correct because if you say " sporco" it means that you don't wash your hair eheheh =) in this case it's better "i capelli biondo spento" (if you want to say that the hair colour is a bit dull) i capelli biondo cenere" (if you want to say that the colour is an arsh blonde)... ciaooo!

ash blonde not "arsh"...sorry!

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