A letter from the Revolutionary War with lines written in invisible ink. Credit: Wikimedia Commons Last year, the US Central Intelligence Agency released documents detailing recipes for invisible ink ...

(KERO) — People have seen it in spy movies, secret messages written through invisible ink. As it turns out, the average person may have all the ingredients needed to make their own invisible ink right ...

In the third of three STEM experiments, Coolidge High School science teacher Jonte Lee teaches students how to make invisible ink using ingredients that can be found around the home. Check out our ...