In episode 24, innocent people meet a glowing coffin, which contains a placenta, that is, a corpse cocoon. If this kind of thing is well preserved, it will be used to prevent the corpse from rotting. Some cocoons are like jade, and some are like amber crystals, which are very transparent. They are wrapped in shriveled bodies of small animals or children, and few of them are adults.
Citation interpretation
These things are usually unearthed as funerary objects, and no one knows how they were made. According to ancient records, (actually from Tomb Raider Notes), 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 fetus in the belly will become a corpse cocoon.
This outer layer is the fossil material of pregnant women's placenta. The amber color you see is actually the solidified amniotic fluid inside. Some people say that this is a kind of embalming technology, which wraps the corpse with special resin mixed with Chinese medicine, so that the corpse does not lose water.