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The tank car was carrying cyclohexanone, a pale and oily liquid that is toxic and flammable.

Two of the tank cars were carrying cyclohexanone, a pale and oily liquid that is toxic and flammable.

The spectrometer the researchers used was set up to sound the alarm if one or more of nine explosive-related materials, such as nitroglycerine, cyclohexanone and triacetone triperoxide, turned up.

Industrial adipic acid production first oxidises cyclohexane to cyclohexanol and cyclohexanone at high temperatures and pressures.

The method was tested with ammonia, cyclohexanone and hydrogen peroxide.