Pouring Molten Tin Into a Bowl of Your Own

Half a day at Nousaku, Takaoka

Takaoka, in Toyama Prefecture, has been casting metal for four hundred years. Nousaku, founded here in 1916, is one of the few foundries anywhere that opens its factory floor, its workshop and its kitchen to visitors on the same afternoon.

A wall of pieces the foundry has produced over the decades

Four centuries of casting

Metal casting came to Takaoka in 1609, when Maeda Toshinaga, the second lord of the Kaga domain, invited foundry masters to settle beside his new castle. Temple fittings, bells and flower vessels followed, and the craft passed down through families until the town itself became the industry. In Kanayamachi, the quarter where those first founders lived, streets of fine-latticed houses and stone paving still stand. Nousaku began the same way, making Buddhist altar fittings and tea utensils for other people's names.

Tin changed that. Tin is soft for a metal; you can bend it with your fingers. That rules it out for tools, and Nousaku decided to treat the softness as a quality rather than a defect. KAGO, a lattice vessel that arrives flat and is opened by hand, becomes a fruit bowl or a vase depending on how far you spread it. The idea that the owner finishes the shape found an audience, and tin tableware is now what the company is known for.

Tin has long been used for sake and tea vessels. It resists corrosion and conducts heat readily, so a chilled cup stays cold in the hand, and the rim meets the lip more softly than porcelain or glass. The material's properties are the reason for the object.

The headquarters, completed in 2017, gathers the foundry, a shop, a cafe and a workshop under one roof. Step inside and the atrium is hung with wooden casting patterns, hundreds of them, the tools of the trade doing the work of decoration. The further in you walk, the harder it becomes to say where the shop ends and the factory begins.

Wooden casting patterns suspended in the entrance atrium

Building a mould from sand

The workshop uses green sand casting: pack damp sand around a pattern, remove the pattern, and pour molten metal into the cavity it leaves. It is the same principle at work on the factory floor a few dozen metres away.

You begin by setting the wooden pattern in a frame and covering it with sand, then tamping it down with a wooden rod. Too little pressure and the sand collapses; too much and the metal will not flow. A member of staff watches your hands and tells you when to stop. Most participants fall silent about a minute in.

NOUSAKU LAB, where each participant gets a frame of their own

Tamping the sand. How hard you press decides the finish

Once the sand holds, the frame is turned over and the pattern eased out. What remains is a hollow in the shape of a bowl. Cut a channel for the metal to enter, and the mould is ready. The sand itself is reclaimed and used again, here and on the factory floor.

The cavity left behind after the pattern is lifted away

The pour

Tin melts at around 230 degrees Celsius, far lower than iron or copper, low enough for a tabletop furnace. Staff ladle the liquid metal and tip it into the mould. The sound of silver running into a small opening in packed sand is quieter than you expect.

Molten tin entering the mould. It sets within minutes

Break the sand away and the bowl comes out rough, with a burr along the rim. The rest of the session is spent taking material off: a bench grinder, then files, then cloth. Tin is soft, so removing too much changes the shape. This slow negotiation with the surface is the longest part of the workshop, and the part most people remember.

Truing the rim on the grinder

The last step is stamping. Letters are driven in one at a time with a hammer, a name or a date, whichever you prefer. Two bowls from the same pattern come out differently, depending on how the sand was packed and how the metal was worked back. The finished piece goes home with you the same day.

Three finished bowls. The same pattern, three different surfaces

Watching the work

A guided tour of the factory runs before or after the workshop, around thirty minutes, following the process from moulding through pouring to finishing while the craftsmen work. It is warm in front of the furnaces in any season, and the air carries the smell of the sand. The tour is free.

The gallery is open to walk through, and the cafe serves meals on the company's own tin and brass. In the shop you can find the same forms you have just made, finished by a professional hand. Setting your bowl beside one of theirs makes the difference in precision very clear, and is worth doing anyway.

You watch the work, do a version of it yourself, and eat off the result. It is unusual for a production site to close that loop in a single afternoon. Takaoka also holds Zuiryuji, a National Treasure temple, and the old foundry quarter of Kanayamachi, which is enough to build a full day around.

Visiting

Nousaku Co., Ltd.

1 Office Park, Takaoka, Toyama Prefecture

About 10 minutes by car from Shin-Takaoka Station, 20 minutes from Takaoka Station. Shin-Takaoka is roughly 15 minutes from Kanazawa by Hokuriku Shinkansen.

Factory tours are free and last about 30 minutes. Casting workshops run in 90-minute and 30-minute formats, with a choice of sake cup, small bowl, small plate or chopstick rests. All require reservation; current prices and session times are listed on the company's website. Closed Sundays and public holidays.

English-language support is limited, so travellers without Japanese may wish to arrange an interpreter or guide in advance.