One reed oil diffuser is made from a 2-oz. bottle ($1.37), sweet almond oil ($7.00), essential oil ($6.75), and bamboo skewers ($6.88). The sweet almond oil is an odorless carrier used to dilute the essential oil. Other odorless vegetable oils like sunflower oil can be used as a carrier. Candle lipophilic dye was only added to see the oil migrate up the reeds,