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영어

To observe 8 essential and 6 heavy metals in hair treated by hair perm and coloring agents, 30 samples of virgin hair which has never experienced hair perm and coloring were collected and analyzed. The experiment groups were treated by hair perm and coloring. While the aluminum level was decreased by repeated perms and colorings, calcium, magnesium, and iron were increased by perm or coloring treatment. Copper, manganese, selenium, and zinc had no significant differences between control and treated groups. The arsenic, mercury, and cadmium levels of treated groups were lower than of controls, but nickel was alike. Chromium and lead were increased by the treatment of perm or coloring, and so these elements that may cause allergy or skin troubles should be controlled.