... Water Bottles Material: Ceramic Ceramic Type: Clay dark-red enameled pottery tea set is made in YIXING . So it's alternate name ... color to emerge from Yixing kilns. Red clay and yellow clay are also used, independently or mixed, and after firing many different colors or ... , purple clay does not contain lead, arsenic, cadmium, chromium, and other toxic materials which do harm to human healthy, whereas ...