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ASH GLAZE
Description
Ash glazes (kaiyū) are ceramic glazes made from the ashes of plants, such as wood or straw. Traditionally, these are divided into three categories: pure wood ash, which is made from the bark of trees such as oak and chestnut and has a faintly blue hue; hearth ash, which contains impurities and has a faintly bluish-green hue; and straw ash, which produces a milky-white glaze.
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Reference: Nihon Kōgeikai Higashi Nihon Shibu (Japan Kōgei Association Eastern Branch), ed., Dentō kōgei-tte nani? – miru, shiru, tanoshimu gaido bukku (What Are Traditional Crafts? –A Guidebook to Seeing, Learning, and Enjoying). Unsodo, 2013.