brown parboiled rice Brown parboiled rice is available from some specialty shops and natural foods stores. Because parboiling drives oils into the bran, unmilled (“brown”) parboiled rice is a little oily. If it is stored in a paper bag, you will see smudges of oil on the sides of the bag a few days after you buy it. Because of the oil, parboiled brown rice will go rancid if kept too long or if not stored in a cool place..