Cascarilla is one, simple ingredient: powdered eggshells and has been used in the Hoodoo tradition and Santeria for protection and cleansing. The powdered is often spread around the inside or outside of the house to protect the space. Cascarilla has two primary abilities: to expel negative energy in all its forms and to create a barrier between the natural and supernatural realms. It’s roots can be traced back to the native traditions of West Africa.
To bless a house, it is sometimes blown from the hand into the room. Another unique technique is to take the powder and use it to drawn sacred symbols on altars or porches. Since it is sold in a compressed mound, it can be drawn with in the same way you would use chalk.
It can also be incorporated into spiritual baths.