Opposite of White Light. Black Light is decentralizing Light while White Light is centralizing Light.
Russell
"If the above paragraph seems strange to you it is because it has not yet been realized that positive material bodies of white light are but MULTIPLIED thought-bodies - and that negative thought-bodies of black light are but divided material bodies." [Home Study Course]
"This first pulsation of the mother-light which is borning God's idea into patterned form is the black light negative half of its pulsation cycle. The unfolding mother-light which reaches out into the heavens is the black light of expansion. Black light is the negative pattern of the positive idea of light as expressed by incandescence. In other words, black light is expanded, or unfolded, white light. Conversely, white incandescent light is contracted, or refolded black light." [Walter Russell, The Secret of Light, pages 201-203]
See Also