Sometimes associated with hell and the devil, Sulfur, most commonly known as Brimstone, is a great tool for destroying an enemy's hold on you or preventing curses and hexes.
 
It is often used in spell and ritual work relating to uncrossing, protection and banishing. You can burn it over charcoal, add it to Magick Bags + Sachets, blends, or use it as an offering. 
 
Powdered Sulphur relates to the Sun, and the element of Fire.