Hi Julie, my hairdresser suggested the chemical free colour, and I think she said it was a Delorenzo brand. The colour seems to last as long as other colours I have used before. My oncologist was happy for me to colour my hair with what ever I normally used. I remember him telling me this soon after diagnosis. I also meant to tell you that I stopped wearing my wig in the last week of September, which was 6 months to the day that my chemo finished. By then I had enough hair to cover my head and though it was still very short and curly, was more comfortable than wearing a wig. Love Chris xx