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by mytailorisrich 1704 days ago
Maybe a reference from a novel [1]. Rough Google translation of the summary: "The black iron is the material recorded in Jin Yong's novels. It is dark in color with a faint red light. It is extremely heavy, has a high melting point, and has a magnetic force."

[1] https://baike.baidu.com/item/%E7%8E%84%E9%93%81/2949942