Toluene is a gas or liquid used as a solvent and as a thinner for certain inks (e.g., some permanent markers), paints, and varnishes. It is typically a synthetic chemical with a sweet-smelling odor, produced from petroleum, and found in gasoline, aviation fuel, and cigarette smoke. Xylene is hazardous because its vapor is toxic. Keep out of the reach of children.(pr. ZI:-leen)Also see clean up and Material Safety Data Sheet (MSDS).