Magnum opus (alchemy) in the context of "Alchemy"

The philosopher's stone is a mythic alchemical substance capable of turning base metals such as lead and mercury into gold or silver; it was also known as "the tincture" and "the powder" as well as "red lion" for gold and "white lion" for silver. Alchemists additionally believed that it could be used to make an elixir of life which made possible rejuvenation and immortality.

For many centuries, it was the most sought-after goal in alchemy. The philosopher's stone was the central symbol of the mystical terminology of alchemy, symbolizing perfection at its finest, divine illumination, and heavenly bliss. Efforts to discover the philosopher's stone were known as the Magnum Opus ("Great Work").

In alchemy and philosophy, prima materia, materia prima, or first matter, is the ubiquitous starting material required for the alchemical magnum opus and the creation of the philosopher's stone. It is the primitive formless base of all matter similar to chaos, the quintessence or aether. Esoteric alchemists describe the prima materia using simile, and compare it to concepts like the anima mundi.

In alchemy, albedo, or leucosis, is the second of the four major stages of the Magnum Opus, along with nigredo, citrinitas and rubedo. It is a Latinicized term meaning "whiteness". Following the chaos or massa confusa of the nigredo stage, the alchemist undertakes a purification in albedo, which is literally referred to as ablutio – the washing away of impurities. This phase is concerned with "bringing light and clarity to the prima materia (the First Matter)".

In this process, the subject is divided into two opposing principles to be later coagulated to form a unity of opposites or coincidentia oppositorum during rubedo. Alchemists also applied it to an individual's soul after the first phase is completed, which entailed the decay of matter. In Medieval literature, which developed an intricate system of images and symbols for alchemy, the dove often represented this stage, while the raven symbolized nigredo.

Citrinitas, or sometimes xanthosis, is a term given by alchemists to "yellowness." It is one of the four major stages of the alchemical magnum opus. In alchemical philosophy, citrinitas stood for the dawning of the "solar light" inherent in one's being, and that the reflective "lunar or soul light" was no longer necessary. The other three alchemical stages were nigredo (blackness), albedo (whiteness), and rubedo (redness).

Psychologist Carl Jung is credited with interpreting the alchemical process as analogous to modern-day psychoanalysis. In the Jungian archetypal schema, nigredo is the Shadow; albedo refers to the anima and animus (contrasexual soul images); citrinitas is the wise old man (or woman) archetype; and rubedo is the Self archetype which has achieved wholeness.

Rubedo is a Latin word meaning "redness" that was adopted by alchemists to define the fourth and final major stage in their magnum opus. Both gold and the philosopher's stone were associated with the color red, as rubedo signaled alchemical success, and the end of the great work. Rubedo is also known by the Greek word iosis.