Black Energy?

English: Energy Arc, central electrode of a Pl...
Energy Arc (Photo credit: Wikipedia)

I have been wondering about black energy. My friends around my area who practice energy work have tried to use black energy and found it to be very uncomfortable, and almost damaging at times. I’ve been able to safely use it from early on and was wondering if its possible for the body to adjust to ‘negative’ energies or if black energy may not be a negative energy at all, or if I might be naturally grounded against it? I think it could be helpful to get a new perspective, because if I can I wan’t to teach them how to safely manage black energy.