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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.
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.
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.
Brian Keith McDonald (born February 18, 1965) [1] is an American screenwriter, director, teacher and author, who lives in the state of Washington.McDonald is best known for the books Invisible Ink, The Golden Theme and Ink Spots, [2] and for the short film White Face.
The AOL.com video experience serves up the best video content from AOL and around the web, curating informative and entertaining snackable videos.
Ágnes Keleti, the oldest living Olympic medalist and Holocaust survivor died in Budapest, Hungary on Thursday.
Learning new things is important if we want to live a long and fulfilling life. Acquiring new skills and performing activities such as puzzles and other brain games strengthens our neurological ...
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]