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lead pencil
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The modern lead pencil was introduced in 1795 and is a writing or drawing tool consisting of a thin rod made from a mixture of graphite, fine clay and binder, which is encased, either in lacquered red cedar, or in a mechanical pencil holder. It is normally available in seventeen grades of hardness, ranging from 9h to 6b (the softest, containing practically no clay).
Subjects: Art & Architecture
