Takatori-yaki Hassen13th Madara Glaze Cup 高取八仙
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Madara glazing cup (straw ash glaze)
Madara glaze is one in which the black dots are seen into the white glaze, creating a mottled (Madara) pattern. In Japanese pottery, Madara glaze is often seen in Karatsu ware (Karatsu-yaki) and Takatori ware (Takatori-yaki).
The black dots are the result of the iron content of the clay, creating patterns in the white glaze.