short for Black and White
Processing:
processing in which the
auditor gets the
preclear to get a current
flow to
run. The
preclear can see the
flow. As long as it's flowing, it's white, and when it is not flowing anymore, it looks black. So you
flow it in one direction as long as it will
flow white. And then it turns around and
flows back as long as it will
flow white.
—PDC Volume 4 Approved Glossary