Nigredo definitions and example sentences on Wordnik

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Talking about Severus as both Dumbledore's apprentice and his mirror image as an alchemist, the Gryffindor / Slytherin androgyn that is "slytherin-side-out," is fascinating, even important (if true!), but it lacks the connect-the-dots transparency of Hermione as alchemical mercury or Sirius as the embodiment of the nigredo.

—HogwartsProfessor.com

Examples (4)

Talking about Severus as both Dumbledore's apprentice and his mirror image as an alchemist, the Gryffindor / Slytherin androgyn that is "slytherin-side-out," is fascinating, even important (if true!), but it lacks the connect-the-dots transparency of Hermione as alchemical mercury or Sirius as the embodiment of the nigredo. — HogwartsProfessor.com
I think what I wrote in Looking for God in Harry Potter about Phoenix has become the consensus view in Fandom conversations about alchemy in the books, namely, that this is Ms. Rowling's "Black Book" and Harry's alchemical nigredo. — HogwartsProfessor.com
The wide and complicated web of schools taught the various aspects of alchemy, involving the philosophy of its Magnum Opus (The Great Work) that consisted of: "nigredo" (or putrefactio), the blackening (or putrefaction) - referring to individuation, purification, burning impurity; "albedo", whitening - meaning enlightenment or becoming spiritual, and "rubedo", the reddening - namely the unity of man with god, merging of the limited into the unlimited. — Softpedia News - Global
1, 2,) nigredo saguinea. — History of the Decline and Fall of the Roman Empire — Volume 4