Foxfire

The bluish-green glow is attributed to a luciferase, an oxidative enzyme, which emits light as it reacts with a luciferin.

The bluish-green glow is attributed to luciferin, which emits light after oxidation catalyzed by the enzyme luciferase.

[3] The oldest recorded documentation of foxfire is from 382 B.C., by Aristotle,[4] whose notes refer to a light that, unlike fire, was cold to the touch.

The glow emitted from wooden support beams in mines was examined, and it was found that the luminescence came from fungal growth.

[7] The "fox" in foxfire may derive from the Old French word faux, meaning "false", rather than from the name of the animal.