The Kyusu Ru Porcelain Teapot is our favorite Japanese style teapot, it was created according to the ancient tradition of Ru Yao roasting porcelain, which forms a pattern on the surface that resembles cracked glass. Over time, during the preparation. Hand wash only with warm water and without detergents. Origins of the Ru slut Ru porcelain is suitable for unfermented and lightly fermented teas, such as green tea and high mountain Oolong tea. Ru Kiln was the principal of the five great furnaces of the Song dynasty. Ru porcelain is famous for the fineness and purity of the clay, the fine workmanship in the shapes and the pure blue color of its glaze. Ru porcelains were once reserved for the imperial court and, according to a contemporary source, only those that were rejected were destined for a wider market.