Not that Mr. Wakem had not other sons beside Philip; but toward them he held only a chiaroscuro parentage, and provided for them in a grade of life duly beneath his own.
There are no more uses of "chiaroscuro" in the book.
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Rembrandt is known for strong chiaroscuro effects.
And now as I approached closer to the front door I saw the two of them pressed together, defined in obscure relief against the pink hallway where a dangling forty-watt lightbulb, nearly engulfed by a cloud of fluttering moths, cast its palsied chiaroscuro.