Tenmoku
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Tenmoku (also spelled "temmoku" and "temoku") is a dark glaze with a surface that resembles oilspotting.
It is comprised of feldspar, limestone, and iron oxide. The more quickly a piece is cooled, the blacker the glaze will be. Tenmoku takes its name from the 天目 (Mandarin: tiān mù; Japanese: ten moku; English: "Heaven's Eye") mountain temple in China where iron-glazed bowls were used for tea.