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    History

    Pencil, from Old French pincel, from late Latin penicillus a "little tail" (see penis; pincellus) originally referred to an … See more

    Wikipedia
    https://en.wikipedia.org › wiki › Pencil

    Pencil - Wikipedia

    • A pencil is a writing or drawing implement with a solid pigment core in a protective casing that reduces the risk of core breakage and keeps it from marking the user's hand. Pencils create marks by physical abrasion, leaving a trail of solid core material that adheres to a sheet of paper or other surface. They are distinct from pens, which dispense liquid or g… See more

    Types

    Graphite pencils are the most common types of pencil, and are encased in wood. They are made of a mixture of clay and graphite and their darkness varies from light grey to black. Their composition allows for the smooth… See more

    Health

    Residual graphite from a pencil stick is not poisonous, and graphite is harmless if consumed.
    Although lead has not been used for writing since antiquity, such as in Roman styli, lead poisoning from … See more

    Manufacture

    The lead of the pencil is a mix of finely ground graphite and clay powders. Before the two substances are mixed, they are separately cleaned of foreign matter and dried in a manner that creates large square cakes. Onc… See more

    Grading and classification

    Graphite pencils are made of a mixture of clay and graphite and their darkness varies from black to light grey. A higher amount of clay added to the pencil makes it harder, leaving lighter marks. There is a wide range of grades a… See more

    External colour and shape

    The majority of pencils made in the US are painted yellow. According to Henry Petroski, this tradition began in 1890 when the L. & C. Hardtmuth Company of Austria-Hungary introduced their Koh-I-Noor brand, named after the … See more

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    Table of Contents
    History
    Types
    Health
    Manufacture
    Grading and classification
    External colour and shape
    See also
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