In preparing the absolutes, hexane is used in the first step which removes all the extractable waxes, volatile oil, pigments etc from the botanical being extracted. Then the concrete is washed in ethanol, chilled to precipitate out the alcohol soluble waxes), filtered and vacuum distilled to remove the ethanol which leaves the concentrated absolute. In the concentrated absolute it is possible that a tiny fraction of hexane remains which would be in parts 100,000 or less. (Source, Christopher McMahon, White Lotus)
