Components of hair dye are thickening agent, aquae hydrogenii dioxide and benzene, which is a toxiferous chemical colourant. So the hair dye is only for external use and cannot be applied onto the skin, otherwise it will cause the symptoms of irritability, red and swollen and running water, even it an cause pathology. When using hair dye, take care not to get it in the eyes, because it will make your eyes pain and make eyes dry. If you are careless to get hair dye in the eyes, you should immediately wash your eyes with clean water, and go to the ophthalmolongy to have an examination and treatment in time, eyes are quite important organs, after all.