I came across the term "black Dianetics" for the first time when I was studying an EPF HCOB. Hubbard wrote that black Dianetics is extremely dangerous and could leave person mentally disabled. However, he didn't provide any further information in that HCOB. I tried to figure out what this term means by myself. I thought that it is an opposite of the regular Dianetics with its purpose of erasing engrams. Thus, in order to practice black Dianetics, you have to knock a person unconscious and whisper nasty things into his year, so to speak. I shared my analysis with the course supervisor. He said that the HCOB says nothing about physically hurting a person, and I should do plenty of word clearing. After the class ended my EPF bodies joked about it. Edmond said that Hubbard knew that black Dianetics works because he used it on someone. During my four-months Sea Org "tenure" I kept asking my coworkers about black Dianetics. But no one knew the answer. Now I am an anti-Scientologist. But the question of black Dianetics still bugs me.