People who work around hair dyes regularly as part of their jobs, such as hairdressers, stylists, and barbers, are likely to be exposed more than people who just dye their hair on occasion. When people dye their hair or have it dyed, some chemicals in the hair dyes can be absorbed in small amounts through the skin or inhaled from fumes in the air. Because darker dyes have more of some chemicals that may cause cancer, these products are of greatest potential concern. Most of the concern about cancer risk has been with the semi-permanent and permanent dyes. Darker hair dyes tend to use more of these coloring agents. In the presence of hydrogen peroxide, these substances go through chemical reactions to become dyes. They contain colorless substances such as aromatic amines and phenols. These dyes are sometimes referred to as coal-tar dyes because of some of the ingredients in them. They are the most popular types of hair dyes, because the color changes last until the hair is replaced by new growth.
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