Have mini detectives, secret agents, or superheroes at home? Keep your creative kids entertained for hours with this fun DIY invisible ink recipe that uses ingredients straight from the kitchen! There ...

Here’s a fun way for junior spies to write covert messages to friends and family. This DIY invisible ink lesson is adapted from The James Dyson Foundation science ...

A lead-based ink can be used to print invisible messages that become legible when decrypted with a chemical trigger. Conventional ‘invisible’ inks are not very secure, because they are easily read ...

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 ...

People have always wanted to communicate privately. There once was a time when regular ink was secret enough, because not much of the world knew how to read. Then literacy ruined it for everyone, and ...