I have a massive allergy to any colouring, anything!! Even henna. I was so desperate to find something that I could use and not ended up in A&E no matter how gentle or the claim to be free of this, of that. Everything gave me a reaction. Until I found water colour. It has literally changed my life. I do not use anything else at all. It allowed me to be grey free and fear free of ending up ill. Thanks so much. I love every colour I have tried and it fairly lasts too. It is not messy and it is planet friendly since I reuse my bowl, brush, mixing bottle over and over.