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Grinding

研 〔研〕 yán

研末〔研末〕yán mò; 磨〔磨〕

Reduction to powder in pestle and mortar. Cinnabar (Cinnabaris, 朱砂 zhū shā) and pearl (Margarita, 珍珠 zhēn zhū) are processed in this way.

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