Suisho-bori (水晶彫 - Crystal Carving) is Tanshin Kiln's unique innovation on the classic hotaru-de (蛍手 - firefly stlye) or linglongyan (玲瓏瓷). Known as 'rice grain porcelain' in English, this is a classic Chinese style of glazed openwork perfected in the Ming Dynasty. In traditional rice grain porcelain, the pierced holes are filled with a semi-translucent clay or glaze, allowing light to shine through.
Wishing to improve on this centuries-old style, Tanshin Kiln's founder, Nagasaki Yuzuru (長崎譲), developed a secret clay blend that becomes completely transparent after firing. Due to the brilliant clarity of this innovation, Nagasaki-san dubbed his new technique Crystal Carving.