It is white phosphorus, which can only be stored in water, and once removed, it burns automatically. Because its ignition point is only about 30 degrees, it can spontaneously combust in the air even if the weather is a little hot. Even in winter, the temperature does not exceed 30 degrees, and when you take it out, it can burn because the temperature of your hands exceeds 30 degrees. So the way to preserve white phosphorus is to put it in water and isolate oxygen.
We may not be familiar with preserving white phosphorus, but I say two things that you know for sure, the first is our matches, and the red gunpowder on the matches is red phosphorus. Red phosphorus is the younger brother of white phosphorus, not as fierce as white phosphorus, and the ignition temperature needs to be above 240 degrees, so it is suitable to use it as a match.
The second thing is the white phosphorus bomb used on the battlefield, also known as hellfire. Because white phosphorus is extremely flammable, it is made**. Many people know that white phosphorus burns as soon as it falls on the human body, because body temperature can ignite this terrible guy.
And that's not the scariest part of it, the scariest thing about it is that the person who designed the white phosphorus bomb will add a lot of binder to the white phosphorus, and it will make the white phosphorus stick completely once it falls on the human body. This terrible phenomenon happened immediately, and the white phosphorus suddenly had a penetrating effect, because it stuck to the body, so it continued to burn. White phosphorus will burn from a person's ** to a person's bones, and the temperature will exceed 1000 degrees, even if only a little white phosphorus falls on the person's body, the person is finished. The most important thing is that you can't put out the fire, whether it's rolling around on the ground or pouring water on your body. As mentioned earlier, as long as the temperature is sufficient, as long as there is air, the white phosphorus will continue to burn until it burns out, so the people who die at the hands of the white phosphorus bombers are miserable.
There is no white phosphorus in nature, it can only be synthesized industrially, and the state prohibits ordinary citizens from buying and selling.