Efun is a white chalk that is comprised of ground snail shell and white clay. Its usefulness is endless. It can be used to appease the Orisa like Obatala, Orunmila, Olokun, Yemoja... etc because of its white color.
Also, it can be used for magical writings, painting the body during rituals and initiations. It is a very powerful medicine. Efun may also be used to cleanse energy similar to sage. From Black Lotus Mobile.