Lead to that of primary lead; some refining processes may be skipped depending on the material recycled and its potential contamination. Of the sources of lead for recycling, lead–acid batteries are the most important; lead pipe, sheet, and cable sheathing are also significant. Contrary to popular belief, pencil leads in wooden pencils have never been made from lead. When the pencil originated as a wrapped graphite writing tool, the particular type of graphite used was named "plumbago" (literally, "act for lead" or "lead mockup"). Lead metal has several useful mechanical properties, including high density, low melting point, ductility, and relative inertness.
Lead Pencil Studio posited by the man-made world." Han and Mihalyo met at the University of Oregon in 1991 while in the architecture program, and their relationship has evolved into a work partnership centered around Lead Pencil Studio. They have also worked in Bellingham, Chicago, Portland, and Seattle, among others. They currently reside in Seattle, Washington. Annie Han was born in Pusan, South Korea in 1967, and attained an accredited Master's equivalent in Architecture (5-year B. Arch) from the University of Oregon in 1993 before studying sculpture for one year at Portland State University in 1994. She is a naturalized US citizen. Daniel