To make invisible ink, you only need a few ingredients - and a lot of patience! Grab a lemon and watch how it's done. Full-Time Kid is available to stream on pbs.org and the free PBS App, available on ...

(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 following is an except from Prisoners, Lovers & Spies: The Story of Invisible Ink from Herodotus to al-Qaeda, by Kristie Macrakis, One of my favorite invisible-ink stories, that didn’t make the ...

IT’S 9:13. WE HAVE A NEW FUN FAMILY ACTIVITY FOR YOU IN THE SCIENCE OF IT. HERE’S FIRST WARNING METEOROLOGIST. ALEXI SHOWING US AN EXPERIMENT MIXING PAPER BAKING SODA AND FIRE. HELLO EVERYONE AND ...

WASHINGTON - The CIA lifted the lid on one corner of the cloak and dagger world of World War I, declassifying six of the oldest secret documents in the U.S. government archives, the agency announced ...

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 ...

So you want to open sealed envelopes without getting caught? Here’s the secret, according to one of the six oldest classified documents in possession of the Central Intelligence Agency: “Mix 5 drams ...

Jean-Michel Basquiat, the late neo-expressionist whose tragic life story inspired a 1996 film, used invisible ink to draw secret figures in at least one of his early paintings, Artnet News reported ...

This article appeared in the September/October 2021 issue of Discover. Become a subscriber for unlimited access to Discover's archive. Can you spot the differences between these baby squids? Look ...