how is lead put into a pencil
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Pencil lead is not lead at all; it's a combination of finely ground graphite and clay, mixed with water and pressed together at high temperatures into thin rods. ... This evolved into a graphite chunk wrapped in sheepskin, followed by a string-wrapped graphite pencil, the first pencil with a rod-shaped graphite core
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Graphite is a natural mineral, a form of carbon. It's powdered, mixed with a substance like fine clay powder (the proportion makes harder or softer grades of pencils) and a binder, then extruded into a rod. The wood is made in two halves with a channel routed out and glued together with the extruded graphite rod inside.
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