Saturn / black crow perching on top of a skull / Visita = Putrefaction Jupiter / black crow watching itself dissolving / Interiora = Dissolution
"The body must be dissolved in the subtlest middle air: the body also dissolves in its own heat and moisture; where the soul, the middle nature, retains dominion over the color of darkness in all parts of the glass: the darkness of nature, which the ancient philosophers called the raven's head, or the black Sun."
— Marsilio Ficino
"Dissolution is the First Operation which has to take place in the Art of Alchemy, for the order of Nature requires that the Corpus, Body, or Matter, be changed into Water which is the much spoken of Mercury. The Living Silver dissolves the adjoined pure Sulphur.
This Dissolution is nothing but a killing of the moist with the dry, in fact a Putrefaction, and consequently turns the Matter black."
— Splendor solis; c. 1582, by Salomon Trismosin