I borrowed from carbon dust technique, which was often used in traditional medical illustration. But instead of carbon dust, I ground up chalk pastels, and "painted" with the dust, alternating layers of dust with workable fixative. Details were added with colored pencil and graphite.
Aspects of Equine Conformation
Medium: Watercolor, pastel dust and colored pencil on Canson Mi-Tientes paper.
Size: 19 x 25 inches.
©1984, Karen Ackoff.