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Invisible ink is not effective with glossy or very smooth paper types, since the sizing of these papers prevents ink from being absorbed deep into the paper and it is easily visible, especially if the paper is examined under glancing light. There are, however, commercially available inks for non-porous surfaces that are only visible under ...
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.
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 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 ...
Ink is used for drawing or writing with a pen, brush, reed pen, or quill. Thicker inks, in paste form, are used extensively in letterpress and lithographic printing. Ink can be a complex medium, composed of solvents, pigments, dyes, resins, lubricants, solubilizers, surfactants, particulate matter, fluorescents, and other materials. The ...
Chemical ink erasers break down royal blue ink by disrupting the geometry of the dye molecules in ink so that light is no longer filtered. The molecules are disrupted by sulfite or hydroxide ions binding to the central carbon atoms of the dye. [3] The ink is not destroyed by the erasing process, but is made invisible.
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Extenders primarily serve to reduce the cost of the ink, but can also impart useful properties to it. They can reduce the colour strength of the ink without adding any white colour to it, which is useful if the pigment in the ink is very tinctorially strong. [2] Extenders can also be used to adjust the ink's consistency and viscosity. [2]
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