Alkenes are precursors to aldehydes, alcohols, polymers, and aromatics. Petroleum ether consists mainly of aliphatic hydrocarbons and is usually low on aromatics. It is not resistant to solvents, aromatics and some chlorinated hydrocarbons. Substitute aromatics such as toluene, xylene and cumene combined with limited benzene solved the problem. Fuel oil is made of long hydrocarbon chains, particularly alkanes, cycloalkanes, and aromatics. Pentanes are miscible with most common nonpolar solvents such as chlorocarbons, aromatics, and ethers. In noncoordinating solvents, such as aromatics or pentane, the complex oligomers predominate, including the trimer. It is an Indian curry blend with added aromatics such as shallots and garlic. Mirepoix or other aromatics may be added for more flavor. He deals with perfumes, scented aromatics and incense. They are well known for their great potential to remediate halogenated ethenes and aromatics. Some research on natural aromatics have shown that many contain compounds that cause skin irritation. The BTX aromatics are very important petrochemical materials. There are a very large number of petrochemicals produced from the BTX aromatics. Even a perfume designated as "single flower" will have subtle undertones of other aromatics.