BLACK FIVE, 1. a heavily occluded case characterized by mental pictures consisting of masses of blackness. This is a “step V” in early procedures such as Standard Operating Procedure 8. (PXL, p. 141) 2. a level of nonperception, whether the person is seeing blackness or invisibility. (SH Spec 271, 305C20) 3. a no-responsibility case. (COHA, p. 161)
Hubbard, L. R., (1975) Dianetics and Scientology Technical Dictionary. Los Angeles: Church of Scientology of California Publications Organization.