A pencil is a writing implement or art medium usually constructed of a narrow,
solid pigment core insidea protective casing.
The case prevents the core from breaking, and also from marking the user's
hand during use.Pencils create marks via physical abrasion, leaving behind a trail of solid core
material that adheres to a sheet of paper or other surface. They are noticeably distinct from pens,
which dispense liquid or gel ink that stain the light color of the paper.Most pencil cores are made of graphite
mixed with a clay binder, leaving grey or black marks that can be easily erased.
Graphite pencils are used for both writing and drawing, and the result is durable:
although writing can usually be removed with an eraser, it is resistant to moisture, most chemicals,
ultraviolet radiation and natural aging. Other types of pencil core are less widely used.
Charcoal pencils are mainly used by artists for drawing and sketching. Colored pencils
are sometimes used by teachers or editors to correct submitted texts but are more usually
regarded as art supplies, especially those with waxy core binders that tend to smear on paper instead of
erasing. Grease pencils have a softer crayonlike waxy core that can leave marks on smooth surfaces
such as glass or porcelain.
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