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  2. Pencil test (South Africa) - Wikipedia

    en.wikipedia.org/wiki/Pencil_test_(South_Africa)

    The pencil test involved sliding a pencil or pen in the hair of a person whose racial group was uncertain. [2] If the pencil fell to the floor, the person "passed" and was considered "white". If it stuck, the person's hair was considered too kinky to be white and the person was classified as "coloured" (of mixed racial heritage). [ 1 ]

  3. 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.

  4. Pencil - Wikipedia

    en.wikipedia.org/wiki/Pencil

    A pencil (/ ˈ p ɛ n s ə l / ⓘ) 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.

  5. Fact check: Pencils are normally used to vote as ink can ...

    www.aol.com/fact-check-pencils-normally-used...

    Numerous claims have been made on social media encouraging voters to take their own pen to the polling station, as a pencil might allow votes to be tampered with.. Evaluation. Pencils are commonly ...

  6. 19 ways the world is designed for right-handed people - AOL

    www.aol.com/19-ways-world-designed-handed...

    Jeff Gritchen/Digital First Media/Orange County Register via Getty Images About 10% of people in the world are left-handed . Lefties have to endure lots of little daily struggles righties might ...

  7. Optical mark recognition - Wikipedia

    en.wikipedia.org/wiki/Optical_mark_recognition

    The first mark sense scanner was the IBM 805 Test Scoring Machine; this read marks by sensing the electrical conductivity of graphite pencil lead using pairs of wire brushes that scanned the page. In the 1930s, Richard Warren at IBM experimented with optical mark sense systems for test scoring, as documented in US Patents 2,150,256 (filed in ...

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