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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.
Yellow dots on white paper, produced by color laser printer (enlarged, dot diameter about 0.1 mm) Printer tracking dots, also known as printer steganography, DocuColor tracking dots, yellow dots, secret dots, or a machine identification code (MIC), is a digital watermark which many color laser printers and photocopiers produce on every printed page that identifies the specific device that was ...
[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 ...
Thalidomide victim, right; Sen. Kefauver and President-elect Kennedy, 1960 Associated Press and Joun Rous/Associated Press. A key provision of the new law made it a crime for drug companies to promote drugs to doctors for patients with illnesses for which the drug, according to its FDA-approved label, was not intended and approved for use.
What is the meaning of core inflation? Core inflation, which strips out volatile food and energy items and is watched closely by the Federal Reserve because it reflects more sustainable trends ...
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 ...