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 It enters the word napalm, a contraction of the "na" of "naphthenic acid" and "palm" of "palmitic acid", originally made from a mixture of naphthenic acid combined with aluminium and magnesium salts of palmitic acid.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
Naphthenic acid The nature, occurrence, recovery and commercial uses of naphthenic acid have been reviewed. Crude oils from fields in Romania, Russia, Venezuela, the North Sea, China, and West Africa are known to be high in acidic compounds as compared to most American crude oils. The carboxylic acid content of certain California crude oils is particularly high (up to 4%) where the most abundant classes of carboxylic acids are reported to be cycloaliphatic and aromatic acids. The composition varies with the crude oil composition and the conditions during refining and oxidation. Fractions that are rich in naphthenic acids can cause corrosion damage