Here in alchemy the Ethiopian is often the symbol of the nigredo, and it is obvious what that would mean in psychological language for it is not very different from the form in which negroes still turn up nowadays in the unconscious material of white people, namely the primitive, natural man in his ambiguous wholeness.
Von Franz identifies the Ethiopian as alchemy’s canonical symbol of the nigredo, interpreting it psychologically as the figure of the primitive, instinct-driven natural man who appears in the unconscious of modern Western subjects.
, Alchemy: An Introduction to the Symbolism and the Psychology, 1980thesis