What is ppd ?
PPD (p-Phenylenediamine) is a substance found virtually in every permanent hair dye, even ones that claim they are totally natural, it is usually hidden under different names. Increasingly there are many henna products, especially black henna which contains PPD
Low tox colour faq.
Some people are sensitive to PPD (p-Phenylenediamine) in permanent hair dye. Some have been given professional medical advice to avoid PPD but would still like to colour their hair without using Henna and other non-professional methods, so they require an alternative to colouring their hair. Chemical Maze classes PPD as "potentially hazardous to health, derived from petroleum, is absorbed via the skin and can cause liver damage