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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.
By varying the speed and strength of each fan, an emitted odor is moved to a specific spot on the screen. The fans operate at a very low speed, making it difficult for the user to perceive airflow; instead he or she perceives the smell as coming directly out of the screen and object displayed at that location. [3]
Henry accidentally washes his and June's clothes with invisible ink, causing them to become naked. In Prometheus and Bob, Prometheus tries to teach Bob how to ice skate. June bleeps out non-offensive words Henry says. Life with Loopy: Loopy enters the TV while Larry is asleep. Henry makes the artists give him chest hair.
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.
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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 ...
Mercaptan is a harmless chemical that smells like sulfur or rotten eggs that utility companies add to natural gas to make it easier to detect leaks, according to Healthline, a medical information ...