My father stewed bone broth for my mother to drink during her hospitalization, and the marrow of that bone was slightly green, I still ate two large pieces. Later I looked up, said the pig bones cooked out of the green mainly because of the short growth cycle of hogs, bone development caused by immaturity. With the continuous improvement of pig rearing technology and feed production technology, the pig rearing cycle is shortened, and the weight can reach 90 kilograms in 6 months and be farrowed. In 6 months out of the pig, due to faster growth, the joints of the bone ossification immaturity, after high temperature cooking, that is, showing green, no harm to the human body. It's just that it shouldn't be as nutritious as the pork of old. I didn't think there was any strange flavor when I ate it. By now I'm fine with it.

There is also a saying that the pork bone may be frozen. And it's been frozen for a long time.

If the soup is particularly green, it is better not to drink it, dispose of it, after all, the body is the most important, if it is slightly green, it should not matter