For an occasion that’s calm, sophisticated, and nice like a cup of warm tea. (Low-key, I guess you could say)
They are matched because foremostly, they share a soft muted-down vintage-y warmth that makes me picture them in a sepia filter. (The warmth is emphasized when the ink is wet, as this ink has a tendency to turn colder in hue when dry.) The softness of the gold nib ensures the wet flow of ink, which gives Cacao du Bresil a brown-er appearance than gray. The ink itself is a wet one, so using it in a wet pen contributes to a warbly soft watery flow that feels so fitting to this particular combination!