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NThe teacup has a unique surface with crackled patterns. It is called Kannyu which is one of the traditional techniques of glazed. " Kannyu" is a small crack in the surface of the glaze due to the difference between the shrinkage of the base material and the glaze. Sumi Crackle Glaze (Japanese: sumi-kannyu) is made by penetrating the cracks in the glaze. This is pottery with changing texture and color. You can enjoy the changing expression. Each one has its own character.ankei Pottey Classic Sencha Kyusu Black Teapot

Sencha Green tea crackle cup

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