Black Light.

Black is the Abyss of Hell where the Dragon of Chaos dwells. Black is the Shadow of Mind, still Morningstar Light doth shine. Black is the Night of the Earth, upon North, the Serpent manifests Worth. Black is the focus, fury, and rage of Willpower, led by Southern, Adversarial Fire. And, most certainly, is Black the Secret of Death, and of Pluto’s Alchemy — the unlocking Key to immortality. It then follows that the magick of the alchemist be Black, for Darkness alone holds the right to manifest Light.