My father gave my mother bone soup when she was in hospital. The bone marrow of that bone turned slightly green, but I still ate two large pieces. Later, I checked and said that the green color of pig bones was mainly caused by the short growth cycle and immature bone development of pigs. With the continuous improvement of pig raising technology and feed production technology, the feeding cycle of pigs is shortened, and the weight of pigs can reach 90 kg in half a year. Pigs slaughtered within 6 months are green after being cooked at high temperature because of their fast growth and immature ossification of joints, which is harmless to human body. It's just not as nutritious as pork before. I don't think it tastes strange when I eat it. So far, I have nothing to do.

It is also said that it is possible that this pig bone is frozen. And it has been frozen for a long time.

Don't drink the soup if it is particularly green. Get rid of it. After all, health is the most important. If it is light green, there should be no problem. After all, you said it was frozen in the refrigerator all night.