澄沙汰砾
    　　Explanation: Means to remove impurities, so pure
    　　Usage: -Linked; as the predicate attribute; with compliment
    　　Source: Qing Yun Jing "Gao Wen Wen Zhang Ji": "Chi Hexin Qi, such as gold in the melting, Cheng Shatai gravel to fine for the same."