Formula texts are quoted from classical Chinese sources and are not translated.
| Source | Ming ● (about 623 years ago) 《永乐大典》 |
|---|---|
| Traditional knowledge – formula |
磁石二钱（ 细研，重筛） 龙骨二钱（ 煅三五次，醋淬，细研之） 骨鲠针铁等。 |
| TKRC | |
| IPC |
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