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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.
Unlike other invisible inks, which require heat or placing chemical liquid over to reveal the message, the UV invisible ink can be scanned and read quickly with an ultraviolet light source without damaging or changing the surface of the paper.
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.
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 ...
[1] [3] According to Wheeler, Johnson had told him lemon juice would make one invisible to security cameras, akin to how it functions as invisible ink. [1] [5] [6] Although initially skeptical, Wheeler had tested this method by covering his face with lemon juice and capturing an image of it with a Polaroid camera. As he was missing from the ...
Invisible ink was used occasionally after Sir James invented two special fluids, and sent a supply to his brother John Jay in New York. Sir James would use the ink at the bottom of brief, friendly letters to his brother and even send the letters unsealed, so that British authorities might inspect the contents.
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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. [18]
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