A silverpoint drawing is made by dragging a silver rod or wire across a surface, often prepared with gesso or primer. Silverpoint is one of several types of metalpoint used by scribes, craftsmen and artists since ancient times. Metalpoint styli were used for writing on soft surfaces (wax or bark), ruling and underdrawing on parchment, and drawing on prepared paper and panel supports. For drawing purposes, the essential metals used were lead, tin and silver. The softness of these metals made them effective drawing instrument.
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Leonardo da Vinci, 
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