In Takayama (Gifu Prefecture), three kilns have developed independently of each other. The oldest is Koito-yaki. At the invitation of the Lord of Takayama, the potter Takeya Genjuro came to Takayama from Kyoto, and in 1630, began to make his elegant tea bowls in high-fired stoneware, with iron and ash glazes. The subsequent history of the kiln is turbulent. After hard times, two potters attempted to produce porcelain in 1836, but the project failed only four years later. The kiln was not reestablished until 1946 from iron-rich clay, glazed stoneware is made for tea ceramics, vases, and restaurant tableware of a more select quality (kappo shokki). Iron glazes, such as ame, kaki, and irabo, are characteristics, as are tea and sake wares influenced by Seto, with bands of cobalt and iron underglaze painting. The cobalt blue ao-irabo glaze which was only recently developed, is unique in Japan. See Anneliese Crueger, Wulf Crueger, and Saeko Ito. "Modern Japanese Ceramics". Lark Books, New York (2007). p 204.