Stock worked with three favorite media&colon; pastels, oils, and silverpoint. More recently he has become involve din silverpoint drawing as well. Joseph Stella was an admirer and drew a particularly fine silverpoint portrait of him. It is possible that he used the silverpoint frequently for the design of his engravings. Silverpoint has also proven adaptable to modern styles. The earliest is a silverpoint drawing created when he was thirteen years old. Silverpoint drawings of this era include model books and preparatory sheets for paintings. On uncoated parchment (and paper), silverpoint is particularly light in value. However, since the 14th century, silverpoint was used more successfully on prepared supports. Silverpoint was also used in conjunction with other metal points by 20th-century artists. Silverpoint was for practical purposes rendered obsolete by the 18th century (Reiche, 2005). In the late Gothic/early Renaissance era, silverpoint emerged as a fine line drawing technique.