Distillation of rosemary performed by creating the vapor with an aqueous solution of caustic soda and ammonium sulphate. The essential oil produced has a more amber color and is cloudy. Applying a drop of this oil on the bedbug's hemithorax causes the bedbug to behave asleep, while the essential oil distilled with water vapor causes it to die almost immediately. If you know a laboratory that performs the analysis of the two essential oils at a low price.