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Personally I know it would help if I could see actual swamp gas in all it's glory
The oxidation of phosphine and methane, produced by organic decay, can cause photon emissions. Since phosphine spontaneously ignites on contact with the oxygen in air, only small quantities of it would be needed to ignite the much more abundant methane to create ephemeral fires.
Chemists have replicated the lights by adding some chemicals to gases from rotting compounds. They argue that the combustion can be sustained at lower temperatures than those found in traditional fires. Taken together, these findings seem to explain two of the more puzzling aspects of the will-o'-the-wisp — its spontaneous, transient nature and its low-temperature "flame" that doesn't seem to burn close-by ignitable items.