The "Ghost Fire" in the Graveyard: It Follows You When You Walk; Some Say It's Phosphorus

At night, passing by a graveyard or a swamp, you see a small blue-green fire floating around. It doesn't burn anything, and if you walk fast, it even chases after you. This is "ghost fire," and there are such stories everywhere.

Legend says it's the soul of the dead, while others say it's "phosphorus" from dead people's bones. In the countryside, elders tell children that if they see this at night, don't run, don't look back, just walk slowly, because once you run, it will chase you. Some places also say that ghost fire is a dead person looking for a substitute, and those who see it will have something happen to someone in their family soon.

The common explanation is that when a corpse rots, it produces phosphine, a gas that can spontaneously combust upon contact with air. The flame is pale blue, with very low temperature, and it doesn't necessarily ignite anything. Rotting plants in swamps also release marsh gas, which sometimes mixes with other gases and produces such flames.

As for "it walks when you walk," the explanation is that when a person moves, they create a breeze that blows that small flame over, making it look like it's chasing you. Once you stop, the wind dies down, and the fire drifts away.

However, this explanation has not been fully verified to this day. Phosphine has rarely been measured in the wild, and some say it's mainly marsh gas mixed with other things. So if you see it, don't touch it with your hand; just pretend you didn't see it. Many people say they saw such fires when they were young—the light was small, flickering in the grass, and no one said it felt hot.

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