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. Permanent (oxidative): Permanent dyes cause lasting chemical changes in the hair shaft.They typically last for 5 to 10 washings. Semi-permanent: Semi-permanent dyes do penetrate into the hair shaft.

Temporary: Temporary dyes cover the surface of the hair but don’t penetrate into the hair shaft.

Hair dyes vary greatly in their chemical make-up. Here is what the research shows so that you can make choices that are comfortable for you. Studies have looked at hair dyes as a possible risk factor for various types of cancer. Many people use hair dyes, which can contain different types of chemicals.

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