Farmer's Friend Extracts Grapehead (Sweet Mendo Kush x Grape Crush) FECO (2g syringe) Grown by: Goodies Originally FECO (Fully Extracted Cannabis Oil) or RSO (Rick Simpson Oil) was produced using naptha or other solvents. Their process uses CO2 combined with ethanol, both of which are removed from the final product. With this method one can produce a full-spectrum edible oil that tends to have a lighter color, higher potency of minor cannabinoids and terpenes, and a better flavor than other oils due to the lack of chlorophyll and presence of terpenes. FECO2 has THC potencies generally in the 60-80% range in order to preserve the critical minor cannabinoids CBG, CBN, CBC.