Douglas Stewart's Premier Ultrasonic Extracted Hawaiian Sandalwood Essential Oil, Douglas last run using the ultrasonic extraction machine from wildharvested Hawaiian Sandalwood by Dr. Nick Berry in Douglas Stewart's supervision. The Hawaiian Sandalwood grows naturally on a massive sustainable eco-plantation on the Big Island, Hawaii. Douglas co-developed an ultrasonic extraction device to produce a superior quality product extracting higher yields from plant material. The ultrasonic device uses ultrasonic waves to breakdown the cell walls and vibrate the essence out from the plant material. A purification/removal process using low temperatures, pressures and rotation is then used to remove the water or solvent from the essential oil or absolute extracted product.