| Fuels such as petroleum are mixtures of various hydrocarbons, and may contain benzene, toluene, xylene, and styrene, and other components. |
| The crude crystals are recrystallized from a mixture of toluene and ligroin by use of decolorizing charcoal. |
| Common aromatic compounds other than benzene include toluene, naphthalene, and anthracene, all of which are present in coal tar or creosote. |
| The powdered bark can also be treated with solvents, such as toluene, or amyl alcohol to extract the quinine. |
| It is petroleum oil turned to jelly, and contains refined oil, gelliants, and butylated hydroxy toluene. |
| These may contain solvents such as toluene, isopropryl alcohol, ethyl and butyl acetates, acetone and other ketones. |
