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A mechanical pencil or clutch pencil is a pencil with a replaceable and mechanically extendable solid pigment core called a "lead" / ˈ l ɛ d /. The lead , often made of graphite , is not bonded to the outer casing, and the user can mechanically extend it as its point is worn away from use.
Lead for mechanical pencils Flexible pencils. Mechanical pencils use mechanical methods to push lead through a hole at the end. These can be divided into two groups: with propelling pencils an internal mechanism is employed to push the lead out from an internal compartment, while clutch pencils merely hold the lead in place (the lead is ...
Lead pencil may refer to: Pencil , a writing implement or art medium usually constructed of a narrow, solid pigment core inside a protective casing Mechanical pencil , a pencil with mechanically extendable solid pigment core called a lead
A copying pencil, also an indelible pencil or chemical pencil, [1] is a pencil whose lead contains a dye. The lead is fabricated by adding a dry water-soluble permanent dye to powdered graphite —used in standard graphite pencils—before binding the mixture with clay .
Pencils are commonly used at polling stations instead of pens. This is because ink might run on to different sections of the ballot and obscure the voter’s choice. The Facts.
The FDA recommends a maximum of 0.1 parts per million (ppm) of lead in candy, but many imported types exceed this limit. The lead usually comes from things like lead-based ink used on the ...
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