Citrinitas

Citrinitas, or sometimes xanthosis, is a term given by alchemists to "yellowness" or the "yellowing". It is the third 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/blackening), albedo (whiteness/whitening), and rubedo (redness/reddening).