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2. Counterfeit banknote detection pen - Wikipedia

   en.wikipedia.org/wiki/Counterfeit_banknote...

   A counterfeit banknote detection pen, used to detect fake banknotes. A counterfeit banknote detection pen is a pen used to apply an iodine-based ink to banknotes in an attempt to determine their authenticity. The ink reacts with starch in wood-based paper to create a black or blue mark but the paper in a real bill contains no starch, so the pen ...

3. Invisible ink - Wikipedia

   en.wikipedia.org/wiki/Invisible_ink

   Invisible ink can be applied to a writing surface with a specialty purpose stylus, stamp, fountain pen, toothpick, calligraphy pen, Cotton swab, or even a finger dipped in the liquid. Once dry, the written surface looks as if it were blank, with a similar texture and reflectivity as the surrounding surface.

4. 3Doodler - Wikipedia

   en.wikipedia.org/wiki/3Doodler

   WobbleWorks launched a Kickstarter campaign for the 3Doodler on February 19, 2013, with an initial fundraising target of $30,000. The campaign closed on March 25, 2013. The $50 reward level was the minimum needed to receive the product, with highly recommended reward levels of $75 and $99 including more bags of plastic thread, and the highest level of $10,000 including a "membership in the ...

5. Ink - Wikipedia

   en.wikipedia.org/wiki/Ink

   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 ...