... covering with golden silky fabric to protect being damaged. Characteristic:Purple clay, which has high iron content, gives its name to ... Purpleclay tea pottery) is a rare earth, from scientific research, purple clay does not contain lead, arsenic, cadmium, chromium, and other ... do harm to human healthy, whereas the research proves that purple clay contains SiO2, Al2O3, Fe2O3, MGO, CaO, these minerals ...