1/4 cup calendula oil. 2 TBSP aloe vera gel. 1 TBSP emulsifying wax. 1 tsp castile soap. 8 drops lavender essential oil. How to Make: Combine walnut shells and castille soap in a small bowl; stir and set aside. Over low heat, combine the calendula oil with the emulsifying wax in a small pot or double boiler and warm until the wax has melted.