Starting fluid is normally known as ether, diethyl ether, or ethyl ether. All types are powerful, some people believe they produce more power than propane. Ethers are incredibly easy to over-fuel however. the upper flammability limit is about the same as the LOWER flammability limit of propane.
Some starter fluids contain oil, which can collect in the combustion chamber and disable lantern sparkers. It may also be corrosive to certain plastic and rubber materials. The fluid can be tested for oil by spraying some on a piece of paper. Any oil will leave a grease stain after the ether has evaporated.