... the tea in fresh taste business craft1.Purple clay tea cup can keep the tea and coffee in ... taste 3 days without changing, 2.The tea cup surface with very beautiful shape, it can ... with artistic culture3.The purple clay is a rare earth, from scientific research, purple clay does not contain ... harm to human healthy, whereas the research proves that purple clay contains SiO2, Al2O3, Fe2O3, MgO, CaO, ...