In China's southwestern Yunnan province, the famous red river with it rich sediments passes by Jianshui and a small village, called Wanyao. When I visited Wanyao first, I instandly was convinced of black pottery not only because of its beauty, but of its qualities high fired clay, smooth surface and mostly pure handicraft. Locals told me to use them for high quality Pu-erh tea, I do agree, proven almost daily.
Black Jianshui pottery
Brown Jianshui pottery