oudo　黄土

KEY WORD :　art history / paintings

Yellow ochre pigment. Lit. yellow earth. Made from earth containing hydrated ferric oxide (goethite FeO.OH or limonite Fe2O3.H2O) often mixed with quartz or clay minerals. The colour can vary from a light yellow to brown depending on the quantity of hydrated ferric oxide. A cheaply available, durable, strong colorant, oudo is commonly found in ancient decorated tombs such as the Ouzuka Kofun 王塚古墳 in Fukuoka prefecture (probably late 6c), and murals like those in Houryuuji *Kondou 法隆寺金堂. It is still used today as a mineral pigment for Japanese painting *nihonga 日本画 (see *iwa-enogu 岩絵具). Oudo can be heated to give a red pigment called *bengara 弁柄.

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