Rubedo

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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.

Excerpt from the Wikipedia article “Rubedo”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Bertuch-fabelwesen.JPG: Friedrich Johann Justin Bertuch (1747–1822) derivative work: Tsaag Valren (talk), Public domain, via Wikimedia Commons.