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2. Mechanical pencil - Wikipedia

   en.wikipedia.org/wiki/Mechanical_pencil

   A commonly-used mechanical pencil lead is identical in density, but not in thickness to a traditional HB (US#2) pencil lead. The hardness depends on the proportion of polymer or resin and graphite in the lead. [16] It is determined by a numerical scale: the higher the number, the harder the lead.

3. Hardnesses of the elements (data page) - Wikipedia

   en.wikipedia.org/wiki/Hardnesses_of_the_elements...

   This page was last edited on 16 November 2024, at 12:16 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

4. Koh-i-Noor Hardtmuth - Wikipedia

   en.wikipedia.org/wiki/Koh-i-Noor_Hardtmuth

   Each pencil was encased in a yellow cedar-wood barrel. The inspiration for the name was the Koh-i-Noor diamond (Persian for "Mountain of Light"), part of the Crown Jewels of the United Kingdom, and the largest diamond in the world at the time. After the Second World War, Koh-i-Noor Hardtmuth was nationalized. It became privately held in 1992.

5. Colored pencil - Wikipedia

   en.wikipedia.org/wiki/Colored_pencil

   A variety of colored pencils. A colored pencil (American English), coloured pencil (Commonwealth English), [1] colour pencil (Indian English), map pencil, [2] pencil crayon, or coloured/colouring lead (Canadian English, Newfoundland English) is a type of pencil constructed of a narrow, pigmented core encased in a wooden cylindrical case.

6. Hardness scales - Wikipedia

   en.wikipedia.org/wiki/Hardness_scales

   The scale of Pencil hardness This page was last edited on 11 February 2022, at 22:38 (UTC). Text is available under the Creative Commons ...

7. Pencil - Wikipedia

   en.wikipedia.org/wiki/Pencil

   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 extended by releasing it and allowing some external ...