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CO2 Extracts: Solvent Extraction CO2 extracts display some of the characteristics of both essential oils and absolutes. Like essential oils, they contain many beneficial therapeutic properties. But unlike absolutes, they are not extracted with petrochemical solvents such as hexane. Instead, they are extracted with CO2 (carbon dioxide) gas under pressure at ambient temperature. Under normal atmospheric conditions CO2 is a gas, but when highly compressed it becomes supercritical - neither a gas nor a liquid. Supercritical CO2 is an excellent organic solvent that is used to extract aromatic oils from plants. The procedure is fast and gentle and is completely enclosed to prevent the presence of oxygen, thus preserving the composition of the chemical constituents. Highly volatile top notes are not lost, and the bottom notes of less volatile and sensitive oxygenated sesquiterpenes are fully preserved as well. Hydrolysis of terpene esters or the loss of terpene alcohols in the heart notes is also largely avoided during extraction. Another impressive benefit of CO2 extraction is that once the oil is extracted from the plant material, the supercritical CO2 is returned to its gaseous state at normal air pressure, quickly and completely dissipating and without generating toxic waste.