Sado Mumyoi-yaki is a type of pottery traditionally produced in Aikawa Town, located on Sado Island in Japan. The term "mumyoi" refers to a type of reddish clay rich in iron oxide, originally unearthed as a byproduct during gold mining operations at the Sado Kinzan (Sado Gold Mine). This unique clay was later repurposed for pottery production.
The origins of Mumyoi ware date back to 1819 (Bunsei 2), when Itō Gei first used flat mumyoi clay to create Raku-style ceramics. In 1857 (Ansei 4), Itō Tomitarō began full-scale production, helping to establish it as a recognized ceramic tradition.
The craft was further revolutionized by Miura Jozan I, who sought to overcome the natural fragility of mumyoi clay. By applying techniques from shudei ware (reddish-purple clay ceramics), he developed a high-temperature firing method that significantly improved the strength and durability of the finished pieces. As a result, Mumyoi ware became known for its remarkable hardness and the clear, metallic sound it produces when struck.
Although its origins lie in Sado, Mumyoi ware has also been produced in other ceramic regions such as Tokoname and Iwami.
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