[Abreu]

Hello there!

I'm a graphic designer and, as a personal project, I would like to make a poster on the theme of amnesia using disappearing ink, so that the mesage will slowly fade over time. I've seen a tutorial on how to do it (http://www.howcast.com/videos/281379-How-to-Make-Disappearing-Ink) but, as it is, the solution oxidizes way too fast (https://www.youtube.com/watch?v=Cr9FZ-FlXIw) and is too liquid for screen printing. Ideally, I would like to produce an ink such as the one used in the printing of The Book That Can't Wait  (https://www.youtube.com/watch?v=gHl8IqCqza8), but any ink sufficiently viscous and lasting a few weeks would be sufficient (http://www.229design.com/wp-content/uploads/2012/11/StefanSagmeister.jpg). Also, are the only possible colors for the disappearing ink red or blue? (https://www.youtube.com/watch?v=ZAZmkz5bs6I)

Any aid will be appreciated.