Because there were no refrigerators in ancient times, there were not so many preservation technologies today, and milk is an extremely perishable drink, so ancient people tried many methods to find ways to preserve milk. In the end, the Russians discovered that they could use frogs to slow down the deterioration of milk. The method was also very simple, that is, throwing a live frog into a milk bucket, and the milk would really remain stable for a longer period of time.
The principle of frog preservation is that there is an antibacterial substance on the surface of the frog's skin. With this antibacterial substance, many bacteria will reproduce more slowly, and the culprit of food rot is bacteria, so the frog's surface secretes This substance can achieve the purpose of preservation. The substances secreted by different frogs will be slightly different, and the secretions of some frogs can even fight against a variety of bacteria and viruses, which is amazing.
However, I think this method is more difficult for people to accept. If a live frog is thrown into a milk bucket, it will probably bring in many other bacteria, and there may also be frog excrement and so on. of. And milk is still for people to drink. Drinking milk soaked in frogs will make many people feel physical discomfort. It is too strong in taste.
Besides, the substances on the surface of frog skin can also cause some harm to the human body and have some side effects, so the method of keeping frogs fresh is really something that the ancients had no idea about. However, we have to admit that the ingenuity and exploration ability of the ancients were able to discover such wonderful uses of frogs. But having said that, it is better to live in the technological era. Food and drinks can be kept fresh in the refrigerator, clean and hygienic, and can be drunk at any time. Technology makes people progress, and technology makes people happy.