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  2. InvisiClues - Wikipedia

    en.wikipedia.org/wiki/InvisiClues

    The clues were not written in invisible ink, which made it easy to accidentally get answers to puzzles. Some of the hints were missing; There were many errors, such as misspellings, mis-capitalizations, formatting issues, and punctuation errors. The clues were not included with The Lost Treasures of Infocom II. However, there was a pay-per ...

  3. Decoder pen - Wikipedia

    en.wikipedia.org/wiki/Decoder_pen

    The decoder pen, yes-no pen, yes-know pen or magic pen book is a combination of decoder pen or marker specially designed to reveal invisible ink-encoded pictures or writing, [1] in the form of answers to questions or hidden parts of pictures, with specially created children's books with hidden words and pictures. They were most popular in the ...

  4. UV marker - Wikipedia

    en.wikipedia.org/wiki/UV_Marker

    UV marker with UV led lamp. An ultraviolet (UV) marker is a pen whose marks are fluorescent but transparent; the marks can be seen only under an ultraviolet light.They are commonly used in security situations to identify belongings or to prevent the reproduction of unauthorized banknotes.

  5. List of pen types, brands and companies - Wikipedia

    en.wikipedia.org/wiki/List_of_pen_types,_brands...

    A pen is a handheld device used to apply ink to a surface, usually paper, for writing or drawing. [1] Additional types of specialized pens are used in specific types of applications and environments such as in artwork, electronics, digital scanning and spaceflight, and computing.

  6. Invisible ink - Wikipedia

    en.wikipedia.org/wiki/Invisible_ink

    Invisible ink can be applied to a writing surface with a specialty purpose stylus, stamp, fountain pen, toothpick, calligraphy pen, Cotton swab, or even a finger dipped in the liquid. Once dry, the written surface looks as if it were blank, with a similar texture and reflectivity as the surrounding surface.

  7. Anoto - Wikipedia

    en.wikipedia.org/wiki/Anoto

    Anoto's dot pattern, when used with aDNA, allows for the unique and unobtrusive marking of physical objects. This then enables easy identification of individual objects using ubiquitous mobile devices such as phones and tablets. aDNA is opening up new possibilities for product innovation, marketing insights, and supply-chain control.

  8. Scantegrity - Wikipedia

    en.wikipedia.org/wiki/Scantegrity

    Scantegrity II ballot and decoder pen. Left: Unmarked optical scan bubble. Right: Marked optical scan bubble revealing confirmation code "FY" The Scantegrity II voting procedure is similar to that of a traditional optical scan voting system, except that each voting response location contains a random confirmation code printed in invisible ink. [4]

  9. Aburidashi - Wikipedia

    en.wikipedia.org/wiki/Aburidashi

    Aburidashi is a ninja technique of sending secret messages using a form of invisible ink. [1] The technique uses ink made of juice extracted from soaked and crushed soybeans . [ 1 ] The message becomes visible to the recipient by heating the paper.