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  2. Invisible ink - Wikipedia

    en.wikipedia.org/wiki/Invisible_ink

    Invisible ink, also known as security ink or sympathetic ink, is a substance used for writing, which is invisible either on application or soon thereafter, and can later be made visible by some means, such as heat or ultraviolet light.

  3. UV marker - Wikipedia

    en.wikipedia.org/wiki/UV_Marker

    Written text with UV ink. In the past, the ink used in UV markers has been made from various things such as lemon juice, vinegar, diluted blood, or even urine. [2] The main components in improvised inks have included dilute laundry detergent, body fluids, tonic water, and vitamin B-12 dissolved in vinegar.

  4. Iron gall ink - Wikipedia

    en.wikipedia.org/wiki/Iron_gall_ink

    Iron gall ink (also known as common ink, standard ink, oak gall ink or iron gall nut ink) is a purple-black or brown-black ink made from iron salts and tannic acids from vegetable sources. It was the standard ink formulation used in Europe for the 1400-year period between the 5th and 19th centuries, remained in widespread use well into the 20th ...

  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. 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 ...

  7. 7 Best Invisible Hearing Aids In 2025 - An Audiologist's Guide

    www.aol.com/7-best-invisible-hearing-aids...

    The Soundly team spends hundreds of hours per month researching and reviewing hearing aids. These are the best invisible hearing aids on the market.

  8. Moral Injury: The Grunts - The ... - The Huffington Post

    projects.huffingtonpost.com/projects/moral...

    Most people enter military service “with the fundamental sense that they are good people and that they are doing this for good purposes, on the side of freedom and country and God,” said Dr. Wayne Jonas, a military physician for 24 years and president and CEO of the Samueli Institute, a non-profit health research organization.

  9. Ink cartridge - Wikipedia

    en.wikipedia.org/wiki/Ink_cartridge

    An ink cartridge or inkjet cartridge is a component of an inkjet printer that contains ink to be deposited onto paper during printing. [1] It consists of one or more ink reservoirs and can include electronic contacts and a chip to exchange information with the printer.

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