We asked Wella hair expert Josh Wood, colourist to stars such as Elle Macpherson, to answer common dip dye queries, from whether the look is still on trend, to how much it really damages your hair, and what shade to go for.Related ArticlesVideo: How to dip dye your hair purple: Smudging TutorialThis is Hair Chalking ??? the hot new hair trendThe Stylist Hair 100CommentsPlease enable JavaScript to