Watermark/Invisible Ink?

[KingDeeDee]

I'm looking for 'watermark' and or invisible ink. That only shows up when held to a light source. For example say I printed trees on a white sheet of paper, and when I held said image up to a light source, a sun would appear, or an image that was otherwise invisible. I've looked around and also herd things about photo emulsion (have no idea how this relates to watermarks), screenprinting, and stamps with regards to watermarks. Any and all help/suggestions appreciated.

 

[niklaus]

Hi!

Most invisible inks are INVISIBLE to natural light. I haven't heard (as of now)of an ink that shows message under normal light. However, there are invisible inks that reveals when lit with UV lights. Aside from that, there are other simple, do-it-your-own steps on making invisible inks over the Internet. Some make use of lemon juice, vinegar and UV inks among others. You can just modify your cartridges and replace the sponge with these 'inks' to print invisible messages through ink-jet printers. But there are also invisible UV inks available for your printer.