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  1. Invisible ink pens use disappearing inks made using chemicals like thymolphthalein and sodium hydroxide. These inks can be of different types, from heat-activated to UV-activated inks. Once the message is written, it becomes invisible and can be decoded using UV light, heat, or chemicals.
    www.architecturelab.net/how-do-invisible-ink-pens …
    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.
    en.wikipedia.org/wiki/Invisible_ink
     
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