Sodium cyanide and hydrochloric acid
In the past, there were craftsmen who made utensils in the room. Sodium cyanide is placed on the case, which is highly toxic. There is hydrochloric acid next to it, which is also commonly used.

One day, while the craftsman was working, he was slightly distracted, causing sodium cyanide to pour into hydrochloric acid. In an instant, the fog rose, and the highly toxic hydrogen cyanide gas escaped. The craftsman did not expect this change, so he couldn't hide his face and avoid it, and inhaled the poisonous gas.

Suddenly, he felt chest tightness and shortness of breath, and his body was like a fire, and the pain was unbearable. He was about to struggle, but his voice was weak. After a while, he couldn't stand on the ground, and his breath faded away.

This accident was also caused by careless operation, Therefore, when dealing with various things, we should be cautious, know the nature of things in detail, and prevent problems before they occur to ensure safety.