Black chalk and white heightening
At an early date artists found they could achieve a rich chiaroscuro by using black chalk together with liquid white heightening on buff or blue paper, which served as a middle tone.
 


Girolamo Muziano (Brescia 1532-Rome 1592). Recto: Study after Michelangelo's Rachel on the Tomb of Julius II; verso: A King Holding a Scepter. Recto: black chalk heightened with white on blue paper, verso: black chalk. 238 x 130 mm., 9 9/16 x 6 3/8 in. Private Collection, New York

 

by Michael Miller
Information supplied by: http://www.nyu.edu/classes