{"product_id":"kosuna-yaki-chawan-tea-bowl-showa-period-deep-black-iron-glaze-tochigi-kiln","title":"Kosuna Yaki Chawan Tea Bowl | Showa Period | Deep Black Iron Glaze | Tochigi Kiln","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThere is a Japanese concept — \u003cem\u003edochaku\u003c\/em\u003e (土着, rootedness in land) — that describes art made not just in a place but from it. \u003cstrong\u003eKosuna-yaki\u003c\/strong\u003e (小砂焼) is one of the purest expressions of dochaku in all of Japanese ceramics. The kiln sits in the village of Kosuna in Moka, Tochigi Prefecture (栃木県真岡市小砂), where potters have worked since the Edo period. What distinguishes Kosuna from every other Japanese black-glaze tradition is this: the glaze is not purchased, not formulated from imported materials, not mixed from standard feldspar and iron oxide. It is made from the iron-bearing clay and stone dug from the ground immediately surrounding the kiln — a strictly local chemistry that cannot be replicated elsewhere. The resulting black is not the dramatic oil-spot tenmoku of Song China or the lacquer-mirror black of Kyoto ware. It is earthier, quieter, and more alive: mottled, textured, with passages of deep brown-black and near-matte grey that shift with the light and the angle. It is \u003cem\u003ejizai\u003c\/em\u003e (自在 — free, uncontrolled) in the best sense.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThis \u003cem\u003echawan\u003c\/em\u003e (茶碗 — matcha tea bowl) is the classic form of the tradition: a wide mouth that invites the whisk, gently curving walls that guide the hands naturally into the \u003cem\u003eryōte-mochi\u003c\/em\u003e (両手持ち — two-handed hold) of formal tea practice, and a low, stable foot ring that grounds the bowl on any surface. The exterior glaze is deep and mottled — Kosuna's iron-black with subtle variation in surface texture, some passages catching light with a semi-gloss sheen, others absorbed into matte darkness. The foot ring is left unglazed, revealing the warm brown iron-rich clay that is the starting material for both body and glaze. The interior is smoothly glazed, clean, and ready for use. The base carries the diamond-shaped kiln stamp (\u003cem\u003ein-ban\u003c\/em\u003e, 印判) of Kosuna-yaki, and the piece retains its original \u003cem\u003etokusen\u003c\/em\u003e (特選 — premium grade) paper label applied by the kiln — both confirming this is a documented, atelier-selected example.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eFor the tea practitioner, a Kosuna chawan offers something different from the grand traditions of Raku, Hagi, or Seto: it is quieter, less assertive, more like something found in the earth than made above it. The black interior holds whisked matcha without visual competition. The exterior's mottled texture settles in the hands like a stone warmed by sun. For the collector of regional Japanese craft, Kosuna-yaki represents exactly the kind of authentic, place-rooted tradition that the global market has not yet fully discovered — which is precisely when to acquire.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eExcellent condition throughout. Glaze intact with no chips, cracks, or repairs. \u003cem\u003eTokusen\u003c\/em\u003e label intact. Kiln-stamped base. Showa period, c. 1970–1990.\u003c\/p\u003e","brand":"Chikoyaki","offers":[{"title":"Default Title","offer_id":45321491316815,"sku":"CHK-CER-KOS-202605-001","price":140.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/6588\/1423\/files\/IMG_1747_result.jpg?v=1779976455","url":"https:\/\/chikoyaki.com\/products\/kosuna-yaki-chawan-tea-bowl-showa-period-deep-black-iron-glaze-tochigi-kiln","provider":"Chikoyaki","version":"1.0","type":"link"}