For use on the skin: Castor oil can be used directly on the skin, however it can be thick in texture. Applying with another carrier oil of your choice will make it more emollient and spreadable. The ratio for using a carrier oil: 2/3 carrier oil, 1/3 castor oil. For use on hair: Warm the oil in the palms of your hands and work into the roots of your hair, brushing it out to the end. Leave in as you would a hair mask (around 15 minutes) and wash out following your favored hair-washing routine. For use on eyebrows: Dip a cotton swap into the castor oil and gently apply to your brows, taking care not to get any oil into your eyes. Leave on over night, and remove in the morning with a gentle cleanser.