silverpoint, method of drawing whereby a silver-tipped instrument is dragged across paper prepared with ground bone dust and gum water and then tinted with a pigment. The procedure results in drawings of extraordinary delicacy. It was used extensively in Europe from the late Middle Ages to the early 16th cent. The silverpoint instrument was a silver thread encased in wood, similar in design to a modern lead pencil. Among the foremost practitioners of the medium were Leonardo da Vinci and Albrecht Dürer.
"silverpoint." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (September 26, 2018). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/silverpoint
"silverpoint." The Columbia Encyclopedia, 6th ed.. . Retrieved September 26, 2018 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/silverpoint