Scented Milk Carton Candles Place paraffin in a can and place can in a pan with water. Heat gently until paraffin melts. Add colored wax or crayon to color. Add liquid orris root to fix the scent. Stir in essential oil after paraffin has melted. Place a small amount of the melted paraffin in the bottom of a milk carton. Press kite string into the melted wax until it sticks. Pour remaining wax into the milk carton. When the candle has hardened, tear away the milk carton.