HumanitiesWeb.org - Glossary definition: Plumbago
Plumbago
(aka graphite or black lead)

A soft black mineral substance, a form of carbon, available in powder, stick, and other forms. It has a metallic lustre and a greasy feel. Compressed with fine clay, it is used in lead pencils (though contemporary lead pencils contain no lead), lubricants, paints, and coatings, among other products.

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