There are different types of Japanese ceramics. Each differs from the material and / or the manufacturing process. Koyama Fujio, a learned Japanese and Chinese ceramist, developed the ‚Six Ancient Kilns‘ in the post-war period to describe Japan‘s most notable ceramics.
Bizen ware (produced in Bizen, Okayama)
Bizen ceramic is characterized by baking at high temperatures, which leads to a signifi can‘t hardness. The reddish brown question and traces of molten ash are the clearest features. The clay is sticky, fine, has a high iron content and traditionally a lot of organic substances. The material has a high shrinkage and has a relatively low fire resistance, which some potters consider to be insuffi cient material. Because of this shrinkage, most Bizen products are not glazed, which is another characteristic. During the firing process, the glaze would peel off, hence the reddish-brown color of the clay.
Echizen ware (produced in Echizen, Odacho and Miyazaki, Fukui)
The Echizen clay also has a high iron content and is not glazed. Therefore, the ceramic also has a reddish brown color. The color changes from black ash to red-brown. The ceramic has a high fire resistance and is fired at high temperature. The difference to the Bizen ceramic is that it isn‘t porcelain. It is made of stoneware. The stoneware is very hard, it has no water absorption or air holes. When fired in a wood stove, ash remains as a natural ash glaze. This property is especially appreciated by tea masters.
Seto ware (produced in Seto, Aichi)
In the case of seto ware, it isn‘t the material or process that is the most outstanding feature. It is the use of a variety of glazes. Four different glazes are typical features of the Seto ware. The Kiseto (yellow), Setoguro (black), Tetsuaka (red) and Uwagusuri (ash) glaze. The diversity of the material, including earthen- ware and porcelain, is the second feature of the seto ware.
Shigaraki ware (produced in Kôka, Shiga, east of Lake Biwa)
The Shigaraki ware consists of a tone of special quality. It is burned in Anagama or Noborigama wood burning stoves. As a result, effects, such as a warm reddish Hiiro flash, deep green naturally ash biidoro or burnt black goat, can be achieved. The Shigaraki ceramics is an example of the mediation of Japanese Wabi-Sabi aesthetics.
Tamba ware (produced in Sasayama and Tachikui in Hyôgo)
A feature of Tamba Ware is that they are not made like the other goods clockwise on the lathe, they are turned counterclockwise. The second feature is the extraordinary color. And the mother of the ash cover. The ceramic is fired in a climbing oven for about 60 hours at about 130 degrees celsius. As a result, chemical reactions occur because the ash from the pinewood is scattered on the ceramic during firing. The ashes and the clay mischievously combined and each time new unique pieces with different patterns and colors are created.
Tokoname ware (produced in Tokoname, Aichi Prefecture)
The clay of the Tokoname ware contains a lot of iron and therefore it is today preferred for iced teapots, because the iron is supposed to smooth the bitterness and astringency of tea. Th e ceramic is unglazed and has a reddish brown color, which results from the high iron content. The chemical process of unglazed reddish brown ceramics is called Shudei.