What harm does bamboo charcoal hair dye have?

Hair dyes generally contain carcinogen p-phenylenediamine. Hair dye comes into contact with skin and is heated during hair dyeing, so that benzene series organic substances enter capillaries through scalp, and then reach bone marrow with blood circulation, which repeatedly acts on hematopoietic stem cells for a long time, leading to malignant transformation of hematopoietic stem cells and leukemia. One of the reasons why hair dyes can cause skin allergies, leukemia and other diseases is that hair dyes contain a chemical called p-phenylenediamine. Experts say that p-phenylenediamine is a colorant that must be used in hair dyes and is an internationally recognized carcinogen.