He takes out a green file-string from his pocket, casually puts one end into his right nostril and draws it out from the other. Radheshyam Kahar is not a magician. Neither are 42 others like him. They have "nasal septum perforations", or simply stated, holes in the nasal wall, splitting the nostrils. They all work at Gujarat's only basic chromium sulphate factory, Hema Chemicals, which employs over 250 workers.Continuous exposure to hazardous emissions has punctured their noses.