It was because of the mercury and it became known as mad hatter disease.
这是由于水银的缘故,它被称为疯帽匠病。
英语百科
Mad hatter disease
Mad hatter disease, or mad hatter syndrome, is occupational chronic mercury poisoning among hatmakers whose felting work involved prolonged exposure to mercury vapours. The neurotoxic effects included tremor and the pathological shyness and irritability characteristic of erethism.