Tada-yaki – The Almost Vanished Celadon of Iwakuni

There are Japanese ceramic traditions about which entire libraries have been written, and there are others for which barely more than a few paragraphs can be found. Tada-yaki definitely belongs to the second group. Anyone holding a bowl from this kiln sees a muted, warm yellow-green covered by a fine web of crackle, perhaps along with a dragonfly incised into the clay with a pointed tool. What one does not see is the story behind it: a small kiln in the easternmost part of Yamaguchi Prefecture that once produced for the shogunate, then fell silent for almost two centuries, and was only fired again in the late 20th century. Much of this can be documented; some of it ends in gaps that, honestly, should be left standing as gaps.

What is Tada-yaki?

Tada-yaki (多田焼) is a Japanese ceramic from the Tada district of the city of Iwakuni in Yamaguchi Prefecture. It originated in 1700 as a kiln of the Kikkawa house, which ruled Iwakuni, and was oriented toward tea utensils from the very beginning – above all Chawan (tea bowls) and Hanaire (flower vessels), which were given as gifts to the shogunate. Characteristic is a light-colored body beneath a Seiji-yū (celadon glaze), the surface of which is covered by a fine network of crackle; this network of crackle is called Kannyū in Japanese. The historical kiln went out of use toward the end of the 18th century. It was not until the 1970s that the potter Tamura Unkei took up the tradition again based on old documents; today the second generation bearing the same artist name continues to operate the Unkeizan-gama kiln – the city of Iwakuni, too, names Tamura Unkei in the second generation as the one who carries on Tada-yaki, and describes the Unkeizan-gama as a chambered kiln (Noborigama).

A Kiln for the Kikkawa House in Iwakuni

The founding is dated to Genroku 13, that is 1700. The lord of Iwakuni at the time had potters brought from Kyōto and commissioned them to pass on their craft to the inhabitants of the Tada district below the castle. The Kikkawa house was a special case within the structure of the Tokugawa period: it descended from a collateral line of the Mōri, administered Iwakuni from the early 17th century with a nominal 30,000 koku, and contended over generations for its rank – Iwakuni was not officially recognized as an independent domain until 1868. For a house in this position, gifts to the shogunate were more than a courtesy. Family records show that in the roughly one hundred years until the kiln ceased operation, nearly a thousand pieces of Tada ware were presented as gifts – tea bowls, flower vessels, and tea utensils of a workmanship meant to withstand the scrutinizing eye of tea masters. The city of Iwakuni dates the founding of this domain kiln to Genroku 13, that is 1700, and describes the beginning as follows: the Kikkawa princely house brought potters from Kyōto, who passed on their craft to the inhabitants of the Tada area; what was produced above all were tea bowls and flower vessels as tribute to the house of the shōgun. The city of Iwakuni dates the founding of this domain kiln to Genroku 13, that is 1700, and describes the beginning as follows: the Kikkawa princely house brought potters from Kyōto, who passed on their craft to the inhabitants of the Tada area; what was produced above all were tea bowls and flower vessels as tribute to the house of the shōgun.

Pale Clay Beneath a Green Glaze

Celadon – in Japanese, seiji – does not refer to a single recipe, but to an entire family of glazes whose green derives from a small iron content. What matters is the kiln atmosphere: only when the firing is conducted under a lack of oxygen, in a reducing atmosphere, does the iron transform into that cool to olive-toned green which this tradition has pursued since its Chinese and Korean models. Tada-yaki uses a pale, whitish clay; it makes the thinly applied glaze glow rather than darkening it. The kiln itself describes its hue with the classical color name kikujin – a muted gray-green that, in court dress, was reserved for the Tennō. The choice of words captures the effect well: the green is never loud, it lies more like a veil over the pale shard and shifts with the incidence of light between olive, yellow-green, and almost gray.

Kannyū: The Network of Cracks in the Glaze

The second characteristic that appears in every description of Tada ware is Kannyū (貫入) – the fine network of hairline cracks that covers the glaze surface. It forms during cooling, because the glaze and the body contract at different rates: the glaze shrinks faster than the clay beneath it and cracks open. What would be considered a defect in industrial production has been deliberately sought after in Japanese tea ceramics for centuries and is controlled through the composition of the glaze. In Tada ware, the crackle pattern turns out particularly fine, a dense network that is barely noticeable from a distance of one meter and impossible to overlook from thirty centimeters. Those who wish to buy a chawan where the eye lingers on the surface without being distracted by decoration will find exactly that in this combination of quiet form and lively glaze skin.

A Thousand Gifts and a Handful of Surviving Pieces

As carefully as the number of presents is recorded in the family papers, the tangible holdings are just as slender: of the historical Tada ware, only a few pieces are said to survive even in Iwakuni itself. In the region, people therefore speak of a pottery that came close to vanishing entirely – a kiln whose products passed almost completely into foreign hands and, over time, lost their attribution of origin there. Even the circumstances of its end are not fully clarified. Most accounts date the extinction to the Kansei era, that is, the years between 1789 and 1801; occasionally one finds differing information that cannot be reconciled with the founding date. The names of individual potters from the historical period are not recorded in the accessible sources. Anyone who engages with Tada-yaki is therefore working from a very thin thread – and should say so openly.

Fire Again After Nearly Two Centuries

Several attempts to revive the kiln did not endure. It was the potter Tamura Unkei (1931–1985), born in Tada, who finally brought the undertaking to completion: in the early 1970s he reconstructed the method of the old kiln from surviving documents and resumed production in Iwakuni. The year given varies by source between 1972 and 1973. His workshop was named Unkeizan-gama, after his own artist name. After his death, the second generation carried on both the workshop and the name — a practice common in Japan, in which an artist name designates less a single person than a workshop lineage. Anyone holding a piece stamped with this name therefore cannot tell from that alone which generation shaped it.

A Kiln in a Disused Mining Valley

In 1981 the workshop relocated its noborigama (a chambered kiln built on a slope) to Kawayama in what is now the Mikawa district of Iwakuni – a valley that until shortly before had lived off mining. The Kawayama copper and pyrite mine looked back on some three centuries of history and, at its peak, employed well over a thousand people; operations ceased in 1971. The kiln itself plays on this contrast, describing its location as a rebirth in the village of the mine. To this day, what is fired there is predominantly tea utensils and flower vessels – the very categories the historical kiln supplied to the shogunate – along with sake cups and bowls for daily use. Visitors can try their hand at pottery in the workshop or take part in a tea gathering with Tada ware.

The Incised Dragonfly and Its Byname

Because the celadon glaze lies thin and translucent, it is especially well suited to incised decoration: lines cut into the leather-hard clay before firing take up more glaze during glazing and appear darker afterward than the surface beside them – the image here is created not through color but through depth. A motif that recurs again and again in this technique is the dragonfly. In Japan it bears the byname Katsumushi (勝虫), literally "victory insect": because in flight it moves only forward and never backward, warriors regarded it as an emblem of unwavering advance, and it adorned helmet crests, armor parts, and sword fittings. When the wooden box of a tea bowl carries the ink inscription Katsumushi-Chawan, it is precisely this reading that is meant – not a pretty insect, but a wish for the one who drinks from the bowl.

What a Local Kiln Means Within the Japanese Ceramics System

Anyone who wants to buy a Japanese tea bowl first encounters the great names: Bizen, Hagi, Karatsu, Arita. They are the visible tip of a system made up of hundreds of small kilns. Some of these were Han'yō or Goyō-gama, domain and court kilns that worked for a single patron and sold nothing on the open market. This is precisely what made them vulnerable: once the patron was gone, the workshop often disappeared within a generation, and with it the knowledge of clay, glaze, and firing technique. Tada-yaki is a prime example of this. Whether such a tradition still exists today depends on three things: whether documents survived, whether pieces were preserved, and whether someone came forward to undertake the reconstruction. In the case of Tada-yaki, the last of these was the decisive factor.

A Bowl from a Kiln Almost No One Knows

A chawan from Tada-yaki does not carry the aura of a great name. It brings something else: a muted yellow-green, a network of crackle that rearranges itself again and again as it turns in the light, a reddish-fired foot ring where you can see where the fire touched the bare clay – and the story of a kiln that did not exist for two hundred years. At densho.de you will find handcrafted Japanese ceramics, each unique work sourced individually from Japan, including tea bowls from small regional kilns that appear in no survey work. Place such a bowl next to a piece bearing a famous name: you will notice how little renown says about the quality of the hand that shaped it.

Sources and Literature

City of Iwakuni, Tourism Promotion Division: 多田焼き「雲渓山窯」陶芸体験レポート, kankou.iwakuni-city.net.

City of Iwakuni, Tourism Promotion Division: 陶芸体験 多田焼き「雲渓山窯」, kankou.iwakuni-city.net.

The Metropolitan Museum of Art: Gourd-Shaped Sake Bottle (Tokkuri) with Carved Floral Design and Jewel, Acc. No. 79.2.805, metmuseum.org.