E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Chiar-oscuro [pronounce ke-ar-ros-ku-ro].
A style of painting now called black and white.
Chiar-oscuro . is the art of representing light in shadow and shadow in light, so that the parts represented in shadow shall still have the clearness and warmth of those in light; and those in light, the depth and softness of those in shadow.Chambers: Encyclopdia, iii. p. 171.