Nujol is a brand of light paraffin oil that was produced by Schering-Plough that was commonly used in infrared spectroscopy. As a paraffin oil it is largely chemically inert and has a relatively uncomplicated IR spectrum, with major peaks between 2950-2800, 1465-1450, and 1380–1300 cm−1. Nujol is primarily a mixture of saturated hydrocarbons, i.e. alkanes with the formula CnH(2n + 2).