Petroleum naphtha is an intermediate hydrocarbon liquid stream derived from the refining of crude oil. Some petroleum refineries also produce small amounts of specialty naphthas for use as solvents, cleaning fluids, paint and varnish diluents, asphalt diluents, rubber industry solvents, dry-cleaning, cigarette lighters, and portable camping stove and lantern fuels. Those specialty naphthas are subjected to various purification processes.