This common bad habit could be making women sick

Dying your hair black

Many hair dyes contain paraphenylenediamine, which gives black and dark brown its tones. It can cause severe allergies, even coma, and the problem doesn’t necessarily appear right after the first dyeing. Dark pigments also have other poisonous elements. For example, coal tar provokes the development of cancer, while lead stays in the body and gets stored in the bones.