... tempetature of oil to 20-30degrees,then put alkali water of 20-30 Be into oil within 5-10 ... to 90degrees,then add some hot water to washing the oil , note the temperature of water is higher for 5-10degrees ... then immobility for 4 hrs, put off the soap water ,so for 2-3 times which is confirmed as the ... to 90 degrees,then mixing for 30 mins,to reduce water to 0.1% ,then put a little clay (decoloring ...