It is one of the three isomers of dimethylbenzene known collectively as xylenes. Some formulations include solvents such as xylenes and cumene. It may also be produced by methylation of toluene, xylenes and trimethylbenzenes. Concerns with xylenes focus on narcotic effects. The mixture of benzene, xylenes etc. It is also generated by methylation of toluene and xylenes. Sediment was contaminated with benzene, bis phthalate, heptachlor, toluene, and total xylenes. In industry, a mixture of xylenes and trimethylbenzenes is alkylated with methanol. Alternatively it can be prepared from InI and indium metal in refluxing xylenes. Petroleum contains about one weight percent xylenes. Petroleum contains about 1 weight percent xylenes. It is soluble in acetone, ethanol, toluene, and xylenes, among other solvents and solvent mixtures. The mixture is referred to as both xylene and, more precisely, xylenes. Sometimes, xylenes and heavier aromatics are used in place of toluene, with similar efficiency. Other substances other than benzene which are highly toxic are toluene, methylbenzene and xylenes (BETX).