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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.
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]
The AOL.com video experience serves up the best video content from AOL and around the web, curating informative and entertaining snackable videos.
World leaders have offered their condolences following the death of former US President Jimmy Carter, who passed away Sunday at the age of 100.
Image credits: Bluest_waters The story of Masabumi Hosoto, the only Japanese Titanic survivor, is a fascinating one. Interestingly, Japan didn't celebrate his survival, as the local media ...
A tattoo made with UV ink becomes visible under blacklight, when it fluoresces in colors depending on the ink chosen, typically white or purple. [18] Although ultraviolet dye is invisible in normal light, scarring produced by the tattoo machine in the application process will remain, and therefore still show.