According to ancient records, this thing may be a drug primer used by alchemists in the pre-Qin period. That is, a pregnant woman less than one month old is killed by soaking in liquid medicine, put in a jar, buried for 17 years, and then dug up, and the baby in the belly becomes a cocoon. This outer layer is the fossil material of pregnant women's placenta. The amber color you see is actually the amniotic fluid solidified inside. Some people say that this is a kind of corpse preservation technology, which wraps the corpse with special resin mixed with traditional Chinese medicine, so that the corpse does not lose water.
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