Naphtha polloi]." It enters the word napalm, a contraction of the "na" of "naphthenic acid" and "palm" of "palmitic acid", originally made from a mixture of naphthenic acid combined with aluminium and magnesium salts of palmitic acid. Naphtha is the root of the word naphthalene, and can also be recognised in the word phthalate, and the paint colour phthalo blue. In older usage, "naphtha" simply meant crude oil, but this usage is now obsolete in English. It was also used for mineral spirits (also known as "Stoddard Solvent"), originally the main active ingredient in Fels Naptha laundry soap. The Ukrainian and
Foam weapon Europe and the UK, the terms "latex weapon" and "LARP-safe weapon" are more common, and combat is usually referred to as "LARP combat". Non-latex foam weapons are primarily used in Jugger and in the Finnish LARP community. The primary concern in designing a foam weapon is safety; a pulled blow with a foam weapon should not hurt the target, and in systems that allow it, even a full-strength blow should not cause injury. Combatants who consistently fail to pull their blows are liable to be ejected from an event, or at least pulled out of the fighting for safety reasons.