// Definition
The residual chemical signature or molecular alteration left behind by a particular extraction process. Every extraction method — hydrocarbon, CO2, rosin pressing, dry sifting — imparts a unique footprint on the final product that can be detected through analytical chemistry, particularly NMR spectroscopy.
// From the Episode
This concept was central to the episode 031 discussion between Bubbleman and Mark Scialdone. Bubbleman argued that dry sift leaves the smallest footprint because it involves no solvents or heat, while hydrocarbon extraction can leave mercaptans bonded to oils at the molecular level. Mark confirmed that NMR can detect these footprints and track how compounds change with heat.