Brush and Wash
Brushes have been in use for both writing and drawing since antiquity. Artists favored brushes made from tufts of squirrel hair mounted in the hollow end of a quill. They were used for a large range of strokes, from fine lines to broad fields of wash.

Artists often combined brown inks with washes of a different color, especially grey, as here, or blue. They also made washes from ground red chalk and used them together with red chalk as a linear medium for rich effect.
 


Stefano della Bella, Allegory of the North Wind
 

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