The material presented os forms he Golden Dawn Self Initiation Book by the Ciceros.
Im simply using this material as a reference point to understanding alchemy, both from a hot and cold processes.
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The goal of Alchemy (both practical and mystical) is to obtain the Quintessence. This is accomplished in a number of stages.
First, the material to undergo the process of transmutation exists with a state of Chaos (Void) which must be separated and categorized to fit into the fourfold model of the Elements.
The alchemist then uses reason to apply this same fourfold model to the First Matter, intellectually structuring it into the divisions of the four Elements.
The Spirit or First Essence (Spiritus Mundi) is then drawn out of the First Matter (implanted within the Alchemists psyche).
This Hidden Essence is then divided or broken down (through the Unbodied Volatile) into the Triad of the Alchemical Principles (Mercury, Salt and Sulfur). At length the Quintessence, which is the synthesis of these Three Principles as well as the sustaining Life Force, is obtained.
There are four colors associated with four distinct stages in alchemical transmutation of metals. In applied or practical Alchemy these stages are identified by the colors shown forth by the Prime Matter as it undergoes the process of transmutation.
During these various levels the metals or materials used are said to undergo a drastic change in appearance, becoming a mud or slime and then a powder. These stages are also related to the four elements. In order they are:
MELANOSIS: Blackening (Earth) also called Nigredo.
LEUKOSIS: Whitening (Water) also called Albedo.
XANTHOSIS: Yellowing (Air) also called Citrinitas.
IOSIS: Reddening (Fire) also called Rubedo.
(Note: by the sixteenth century these colors were reduced to three the yellowing stage was dropped, resulting in a triad of colors: black, white and red.)
Melanosis is the first state, which is either present from the onset as a quality of the Prime Matter, or obtained from of a process of separation, death, dissolution or putrefaction.
The next stage is Leukosis, which signifies a washing or cleansing process, a resurrection and the release of the pure essence. (This results in the white tincture or Lunar essence symbolized by the White Queen.)
The final stage is Iosis, which results from the raising of heat to its highest intensity. (The Red King or Solar essence is the symbol here.)
Other colors may also be seen in the process. These additional colors rep-resent intermediate states in the process.
The four colors listed above are usually the only recognized colors in Alchemical work. After the black stage of Melanosis, the color blue may be seen, which is considered a feminine aspect, indicative of Height and Depth. After the red stage of Iosis, the color of violet may be seen to indicate the limit of the process.
The colors of Alchemy can be associated to the Planets in the following manner:
BLACK: Saturn (lead)
BLUE: Jupiter (tin)
PEACOCK’S TAIL: (multi-eolored) Mercury (quicksilver)
WHITE: Luna (silver)
YELLOW: Venus (copper)
RED: Mars (iron)
VIOLET: Sol (gold)