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  2. Invisible ink - Wikipedia

    en.wikipedia.org/wiki/Invisible_ink

    Invisible ink is not effective with glossy or very smooth paper types, since the sizing of these papers prevents ink from being absorbed deep into the paper and it is easily visible, especially if the paper is examined under glancing light. There are, however, commercially available inks for non-porous surfaces that are only visible under ...

  3. 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.

  4. UV marker - Wikipedia

    en.wikipedia.org/wiki/UV_Marker

    Messages written by a UV marker can be discovered by unintended viewers when there is a change of reflectivity of the paper, or a pen scratches marks on the paper. The smell of the ink also reduces the security of secret messages as the hidden messages can be easily found with the help of trained animals.

  5. Ink eraser - Wikipedia

    en.wikipedia.org/wiki/Ink_eraser

    Chemical ink erasers break down royal blue ink by disrupting the geometry of the dye molecules in ink so that light is no longer filtered. The molecules are disrupted by sulfite or hydroxide ions binding to the central carbon atoms of the dye. [3] The ink is not destroyed by the erasing process, but is made invisible.

  6. 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]

  7. 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 ...

  8. Talk:Invisible ink - Wikipedia

    en.wikipedia.org/wiki/Talk:Invisible_ink

    Start a discussion about improving the Invisible ink page Talk pages are where people discuss how to make content on Wikipedia the best that it can be. You can use this page to start a discussion with others about how to improve the " Invisible ink " page.

  9. Pounce (powder) - Wikipedia

    en.wikipedia.org/wiki/Pounce_(powder)

    Pounce is gently sprinkled all over the writing on the paper. When using a quill or a steel nib, and with inks that are made up to match those typically in use during the 18th and 19th centuries, and provided the pen has been used with the fine strokes typical of handwriting of that period, the handwriting will be sufficiently dry within 10 seconds to allow the paper to be folded without blotting.