A common grayness: Andrea del Sarto was distinguished for his skill in chiaro-oscuro.
"Introduction to Robert Browning" by Hiram Corson
He also made a great advance in coloring: he invented chiaro-oscuro.
"Beacon Lights of History, Volume III" by John Lord
No one gets farther away from the academic grayness, the colorless chiaro-oscuro of the conventional painters.
"French Art" by W. C. Brownell