Humans have had a long history with sending secret messages. The practice dates back to ancient Greeks tattooing a servant's head to a modern-day employee stealing corporate secrets. Invisible ink is ...

Step into the hidden science lab in your kitchen with five easy experiments that explain refraction, surface tension, ...

EFFINGHAM COUNTY, Ga. (WTOC) - In this Summer Science experiment students at Effingham College and Career Academy show us how to create invisible ink using a lemon. - When the lemon juice is heated a ...

(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 ...

The science pros at TKOR show how invisible ink can be made and revealed. 'Please save me': Techie's final call to father ...

William Abel, a mail censor at Iowa's State Prison, Fort Madison, using a hot iron to bring out a secret message written in lemon juice on a letter.Three Lions/Getty Images Humans have had a long ...