Out with the new, in with the…old? Cellophane treatments are a thing of the ‘90s, before hair dyes of the 21st Century came in, and they are semi-permanent colouring treatments that helped those with virgin hair experiment with colour. Recently, it has been rediscovered by salons around the world for its non-damaging properties; it adds subtle colour to the hair, while simultaneously working to lock in moisture, add shine and promote thickness.