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2. Mechanical pencil - Wikipedia

   en.wikipedia.org/wiki/Mechanical_pencil

   Pencils with sub-millimeter leads can usually hold multiple leads at the same time, reducing the frequency of refills. One exception was the Pentel 350 E, possibly Pentel's first mechanical pencil, [14] which could only hold a single stick of 0.5 mm lead. Refill leads can be bought in small tubes and inserted into the barrel as needed.

3. 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.

4. Grease pencil - Wikipedia

   en.wikipedia.org/wiki/Grease_pencil

   Two grease pencils Historical diplomatic usage. The grease pencil, a wax writing tool also known as a wax pencil, china marker, or chinagraph pencil (especially in the United Kingdom), is a writing implement made of hardened colored wax and is useful for marking on hard, glossy non-porous surfaces.

5. Pencil - Wikipedia

   en.wikipedia.org/wiki/Pencil

   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 ...

6. Non-photo blue - Wikipedia

   en.wikipedia.org/wiki/Non-photo_blue

   The difference between the non-photo blue and black ink is great enough that digital image manipulation can separate the two easily. If a black-and-white bitmap setting is scanned in, the exposure or threshold number can be set high enough to detect the black ink or dark images being scanned, but low enough to leave out the non-photo blue.

7. Zebra (pen manufacturer) - Wikipedia

   en.wikipedia.org/wiki/Zebra_(pen_manufacturer)

   A mechanism employed in the DelGuard system developed by Zebra, causes the lead sleeve in a mechanical pencil to extend outward when excessive pressure is applied at an angle. When excess vertical pressure is applied on the lead, the lead is automatically retracted inwards. Thus, the lead is protected (within certain limits) in both cases.