The concept of herring stone or herring stone powder often appears in the treasure-seeking chapters of fairy tales and the names of props in online games to ward off evil spirits and detoxify. Such as the novel "Ghost Blows the Lamp" and the online game "Love between Swordsman 3".
There are many kinds of herring, and the herring (black pomfret) with this stone, also known as snail green, is a kind of freshwater fish, weighing dozens of kilograms. This kind of fish likes to eat snails, and herring stone is suspected to have evolved from the hyperplastic hard bone used to crush snails in the throat and jaw for many years. And it often takes dozens of kilograms of big fish. Other ordinary fish don't have this kind of stone, so it is rare and precious. After core removal, the material of fish stone is stable and can be preserved for a long time.
Selection method: In case of big herring, cut off the joint between the fish head and the fish body, and search whether there is a heart-shaped foreign body embedded in the fish bone but relatively independent, not connected with other fish bones near the throat and jaw. Generally, the naked eye can see the obvious difference between it and other bones, and it can be pried open with a screwdriver or a knife after discovery.
In the custom of herring, there is often the custom of pickling into dried herring. In the process of flooding, try to fish out the fish stones one or two weeks after adding salt. The color of the fish stone will be older, and there will be internal turtle cracks as shown in the figure. When the salty taste comes in, children will take the initiative to suck when they are scared, and adults can often stop their bad emotions when they are scared. According to analysis, psychological factors may play a role.