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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.
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 ...
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.
The fluorescent dyes cause a chemical reaction when exposed to high intensity light sources (HILS) and the visual result is a fading in the colors of the inks. With paper, significant visible change in the color saturation can typically be observed within 45 minutes to one hour of exposure to the HILS.
It is advised to check the references for photos of reaction results. [1] Reagent testers might show the colour of the desired substance while not showing a different colour for a more dangerous additive. [2]
Tattoos made with any ink can sometimes cause allergic reactions, irritation, and other side effects, although some chemical components tend to trigger more reactions than others. UV tattoo inks made with PMMA or melamine have been documented to occasionally cause irritation ( dermatitis ) and inflammation (including granuloma ).
The bow and arrow pose. When Swift sings her song "The Archer," she makes a gesture as if she's pulling a bow and arrow. Fans quickly edited a moment from the Eras Tour shot beside footage of ...
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]