Black magic involves using supernatural powers for evil purposes. It has a long history dating back to ancient civilizations like the Egyptians and references in texts like the Vedas and Quran. Common black magic techniques include the use of tools like bones and blood as well as coloring and number methods. Symptoms of black magic include nightmares, quarrels, illness and negative effects on wealth, happiness and behavior. Removing black magic involves reciting prayers and blowing on water.