In alchemical treatises, the formula L'Oeuvre au Noir … designates what is said to be the most difficult phase of the alchemist's process, the separation and dissolution of substance. It is still not clear whether the term applied to daring experiments on matter itself, or whether it was understood to symbolize trials of the mind in discarding all forms of routine and prejudice. Doubtless it signified one or the other meaning alternately, or perhaps both at the same time.
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About Marguerite Yourcenar
Marguerite Yourcenar was a 20th-century French novelist and essayist. Marguerite Yourcenar was a Belgian-born French novelist and essayist who became a US citizen in 1947. Winner of the Prix Femina and the Erasmus Prize, she was the first woman elected to the Académie Française, in 1980. Read more on Wikipedia →