When life becomes aware of itself, it hates what it sees and wants to die. The black sukha is the perfect, terrible state between the self-loathing of life and the self-annihilation of death, where self-destruction is the only mechanism of pleasure.
Do not make the mistake of thinking only the red bhang may take you there; this state may be achieved by use of any poison. It requires only that you submit yourself to it absolutely. Our red bhang is simply more likely to bring you back.