Black magic is manipulation of energy for the purpose harming somebody. There is no god or devil involved in this. It is pure energy manipulation. The same energy can be used for good purposes as well. The devil, satan etc are all figments of the imagination. Its only energy that has been manipulated. One thing is certain and from experience i can say that the person who does black magic on others gets back the same amount of negative energy often resulting in a horrific death of the black magician.
It is ok to know and learn about this subject but stay away from practicing it.
The victim’s clothes, hair, nails etc are used in this ceremony. Energy is then manipulated to attack the victim directly. When negative energy is concentrated in such a manner the result is death, pestilence, bad luck etc. If the victim prays to a higher energy source or asks a tantric for the black magic to be reversed then the black magician gets back the negative energy multiplied thousand fold and is doomed. If you see a banana leaf with rice, turmeric and strange looking things on it do not step on it. Move away from it as it is all the negative black energy in concentrated form.
Bottom line is…Stay away from people who practice this.