After the whitening of the albedo comes the last phase of the Great Work: the red phase, or reddening.
The white phase consisted of an intense process of purification, in which all the rotting decayed matter that had died during the nigredo was thoroughly cleansed of impurities. What was left was then considered clean but also very sterile, incapable of producing new life and lacking animation.
The purpose of the red phase was to make the matter come alive again. This process was initiated with the completion of the last phase of the albedo, conjunction, which was known to alchemists as “the marriage of the sun and moon.”
The rubedo continues this work of uniting opposite energies or elements until the Great Work has been completed.
The first process in the red phase of alchemy is known as fermentation, where the alchemist receives visions and other types of inspiration that will ultimately guide them to the end of the Great Work.
This is followed by a long process known as distillation, in which the alchemist is tasked with separating “the earth from the fire, the subtle from the gross.”
The final phase, coagulation, marks the completion of the Great Work and the creation of the Philosopher’s stone.