A burning in the late Northern Song Dynasty Ru Ru a burning in the late Northern Song Dynasty, is one of the song "five famous kilns". This product is the pea green glaze flower mouth wash, glaze containing agate, green luster glaze Wordsworth, sparkling juice fatness, praised by ancient, "porcelain crown" Jiayu, Taizhi delicate, hard, yellowish gray color in fetal, plus Ru kiln before and after only twenty years of time because of long time, burning building, handed down nor more worthy of collection!