What is the strange poisonous crane that sealed its throat with a sword in ancient times?

To put it bluntly, Hemlock Red is arsenic with insufficient purity. It's interesting that the ancients took such a name, which made me always think that this poison was to dig the head off the red-crowned crane when I was a child.

1. The crane top is not on the crane?

When I was young, I especially liked watching costume dramas, so I committed suicide by taking poison, and it is not uncommon to kill me by poisoning. At that time, the director especially liked to plant a poison-He Dinghong. It is said that this poison is colorless and tasteless, killing people is invisible. Most importantly, you will die immediately after eating it.

I remember a fragment of a costume drama played like this. At that time, the protagonist found a red-crowned crane to poison the bad guys, and after saying sorry to them, he took their red tops (red things on the red-crowned cranes' heads). After returning to China, it was quickly developed into poison, which killed the villain and made people happy. From then on, I was misled by this director for many years. It was not until a long time later that I realized that He Dinghong had nothing to do with the red-crowned crane. Dante of the red-crowned crane is not poisonous. He can neither kill the dead nor kill the small animals. Please give the crane a clean record.

2. Where does Heding Red come from?

Everyone except He Dinghong should have heard of arsenic, which was also a fearsome poison in ancient times. In fact, arsenic is extracted from Heding Red, which is a natural ore and is red. When refining, some ores are not pure enough to turn into arsenic, but only keep their original red shape, so they are called crane top red. Although it is not as overbearing as arsenic, it is also very toxic. As long as the dose is used, the user will die.

In a word, Hemlock Red and Arsenic are like twins, only slightly different. I don't know why someone would mix it with such a beautiful animal as the red-crowned crane. Maybe the ancients saw this red stone and thought of the head of the red-crowned crane.