Tōki means 'ceramic', yaki means 'fired' and Shigaraki is a village in Shiga not far from Kyoto. Shigaraki-yaki pottery is one of the Six Ancient Potteries of Japan and is registered as a Japanese cultural heritage site. This oldest pottery production area in Japan has a tradition of 1,300 years. When Emperor Shomu started building the imperial court Shigaraki no miya in 742, nunome-gawara roof tiles and sueki pots were first produced here. Later, various products in different sizes were added, such as mizugame, tanetsubo, chatsubo, chaki, i.e. jugs for water, seeds or tea, as well as tea sets, which to this day express the feelings of wabi and sabi and are particularly typical of Shigaraki-yaki. The size of the pottery originally produced in the Shigaraki production area had a maximum diameter of 60 cm. Through numerous experiments and the experience gained, it was finally possible to develop a process that enabled the production of clay bathtubs with a diameter of up to 2 metres. These handmade bathtubs are made according to the needs of the customer. A multitude of wishes regarding dimensions, details, surface texture as well as colour can be taken into account.
A ceramic bathtub is far superior to normal standard bathtubs in terms of heat retention. In addition, a Shigaraki-yaki bathtub promises a much greater relaxation effect due to the emission of far-infrared rays (FIR). The craftsman's endeavour is to produce unique Shigaraki-yaki bathtubs and to convey the exclusive wabi-sabi of clay and thus the Japanese sense of beauty and the warmth of earth and people.


After preparing the mixture of Shigarki clay, together with a special blend of other raw materials and water, the first step is to shape the tub. On a circular or oval modelled base plate, the material is applied by hand, in the form of strands, layer by layer, all around - until the wall height is reached. A distinction is made between two methods: rokuro seikei, where a potter's wheel is used to form rotationally symmetrical hollow bodies (exclusively for round tubs up to 130 cm in diameter), and teneri seikei for larger or oval components, which are formed entirely by hand. The resulting blank with a solid, thick tub wall requires 2 to 3 weeks of air drying, so that the initial humidity of 20% is reduced to a value of 5%. As a further preparation for firing, a 2-day stay in the drying chamber follows. The drying process causes shrinkage, which has to be taken into account in the shaping process beforehand. Firing takes about three days, whereby the temperature in the kiln is slowly increased to 1250 °C; cooling in the kiln is equally slow and takes about two days. As a surface finish, for smoothing and sealing against liquids, glazes in different colours are applied, for example kogeyohen (burnt brown) or kuromatto (matt black).


These ceramic bathtubs are ordered and manufactured according to the customer's personal requirements:
- dimensions (for one, two or more persons)
- shape (round or oval, different diameters)
- sositioning (free-standing, lowered into the floor)
- design of various details and wooden tub cover
- choice of surface texture and colour of glaze.