According to the report of the Commission of the International Agency for Research on Cancer (IARC), the headquarters of which is located in Lyon (France), "men who are hairdressers, a small but consistent risk of bladder cancer." The authors of the second report on the effects of hair dyes found in the apartment several studies. For possible associations with cancer of the bladder, as well as lymphoma and leukemia However, the Commission has reported to the conclusion Interpress that the evidence is not sufficient, and found that the use of hair dye at home "can not be regarded as carcinogenic factor influencing the person." The Commission was. Of 17 scientists who met in February, in order to review the latest data and adapt, composed of the recommendations, as amended by the Agency in 1993 Persistent and temporary polustoykie: Modern hair dyes are divided into several categories. Resistant, they are also the oxidative hair dye for 80% of the market, and they are made of colorless "mediator substances" and binders that react chemically in the presence of hydrogen peroxide and color together. The highest content of coloring ingredients usually in dark hair dyes. In the 1970s, the use of some of these funds have been closed as their toxicity has been demonstrated in experiments with rats.
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