Cascarilla Powder or Eggshell Powder is a powerful Magickal tool for protection and cleansing. Just a little sprinkle goes a long way. 
The best way to use Peace Powder is to repel negative energy and to put a protective shield around you and your space.
You can sprinkle it on your head or around the space ( windows, doorways, floors or anywhere in the house with opening to outside).
Best way to protect yourself is to take a ritualistic bath with powder. 
Best use with Palo Santo, Sage and Protection Candle.