Liquid fire
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Liquid fire is a term commonly used to refer to liquid incendiary substances. The term probably first referred to boiling oil used as a siege defense. In the Hellenistic through Byzantine periods of Western civilization, it commonly referred to Greek fire.In ancient China there were also the practice of petroleum Meng Huo You. In World War I and World War II, flamethrowers were used to project flaming liquids. Today, the term is most commonly applied to napalm.
Also to refer to tincture of benzoin when used to treat blisters, as it burns the raw skin.