This low sodium variety of toluene is used in the industrial manufacturing process for silicon wafers used in microprocessors and printed circuit boards, as it is an excellent solvent. Typically, toluene is used for rinsing impurities and contaminants that accumulate during the microprocessor manufacturing process. Toluene is a colorless, water insoluble liquid most frequently associated with the smell of paint thinners and derived from mono-substituted benzene. For this reason, the systematic name of toluene is methylbenzene, and is primarily applied as an industrial feedstock and as a solvent. Toluene was originally extracted via distillation of pine oil, taking its name from the balsam tree of Tolu where it was first isolated in 1837. It is a naturally occurring substance found in small quantities in crude oil, and is also a byproduct of gasoline production. It can furthermore be extracted as a byproduct of coke production from coal, and is typically purified via distillation or solvent extraction.