nigredo

Etymology
From.

Noun

 * 1)  A process of putrefaction or decomposition, one of the four major stages of the alchemical magnum opus.
 * 2)  A term in Jungian psychology referring to mental negativity.
 * 1)  A term in Jungian psychology referring to mental negativity.
 * 1)  A term in Jungian psychology referring to mental negativity.

Etymology
From.

Noun

 * 1) blackness