The Seba library treats Black Cloud in 9 passages, across 5 authors (including Jung, Carl Gustav, Edinger, Edward F., von Franz, Marie-Louise).
'Black clouds' are the nigredo (Mylius, p. 234, and 'Tractatus aureus,' Ars chemica, p. 15).
Jung establishes the black cloud as a canonical alchemical symbol for the nigredo, citing Mylius and the Tractatus aureus as authoritative sources within the broader symbolic constellation of cloud imagery in alchemy.
, Mysterium Coniunctionis: An Inquiry into the Separation and Synthesis of Psychic Opposites in Alchemy, 1955thesis
I saw a great cloud looming black over the whole earth, which had absorbed the earth and covered my soul, (because) the waters had come in even unto her, wherefore they were putrefied and corrupted before the face of the lower hell and the shadow of death.
Edinger quotes the Aurora Consurgens at length to present the black cloud as the archetypal image of the initial darkness — the alchemical nigredo as experienced by the soul — which opens the recipe of psychological transformation.
, The Mysterium Lectures: A Journey Through C.G. Jung's Mysterium Coniunctionis, 1995thesis
It is first shown in the form of the black cloud which covers the earth and the soul or woman who is redeemed from it, and then it comes in the form of a flood covering matter.
Von Franz identifies the black cloud as the recurring inaugural image of the nigredo in each of the Aurora Consurgens parables, structurally paired with the albedo figure of the redeemed feminine soul.
, Alchemy: An Introduction to the Symbolism and the Psychology, 1980thesis
cloud, black, 203, 206, 207-208, 241
Von Franz's own index to her Alchemy lectures records 'cloud, black' as a discrete symbolic category treated across multiple lecture pages, confirming its systematic importance in her reading of the alchemical opus.
, Alchemy: An Introduction to the Symbolism and the Psychology, 1980supporting
'The quicksilver is fixed in the cloud that is of the same essence.' And Hermes (III, xxi, 3): 'Triturate the cloud in the sun.'
Von Franz's annotation assembles early Greek alchemical citations in which the cloud is an active material agent co-substantial with the prima materia, providing the technical substrate underlying the black cloud's symbolic weight.
, Aurora Consurgens: A Document Attributed to Thomas Aquinas on the Problem of Opposites in Alchemy, 1966supporting
The strange idea that the black cloud possesses a sort of nervous system, and a psyche or intelligence to match, is not an original invention.
Jung reads the black cloud of Hoyle's science-fiction as a modern mythological image of autonomous psychic intelligence approaching from outer space, connecting it to the longstanding archetypal pattern of the numinous dark entity.
, Civilization in Transition, 1964supporting
Here is the 'terrible home of dark Night, covered in dark clouds.'
Padel traces the classical Greek association of dark clouds with the underworld and death, providing the Homeric background against which the alchemical and depth-psychological symbolism of the black cloud is intelligible.
, In and Out of the Mind Greek Images of the Tragic Self, 1994supporting
The cloud is bright when viewed from the outside but causes darkening when one is enveloped in it (skia, shadow, shade). Thus during Christ's transfiguration, 'there came a cloud, and overshadowed them: and they feared as they entered into the cloud.'
Edinger notes the theological ambivalence of the divine cloud — luminous externally, darkening internally — which informs the alchemical black cloud's dual character as both affliction and numinous presence.
, The Christian Archetype: A Jungian Commentary on the Life of Christ, 1987aside
European and Egyptian alchemists' associations around black are very close to the Africans': black stands for crude matter, the 'prima materia,' lead, and Osiris' body when in the underworld.
Bly situates the alchemical meaning of black within a cross-cultural symbolic field, supporting the depth-psychological reading of the black cloud as an image of the prima materia and the condition of mortification.
, Iron John: A Book About Men, 1990aside