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 ...

(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 ...

Beth Harris, Raleigh mom and science educator, returns today with a really fun and easy experiment for kids to try - invisible ink! All you need is a piece of paper, milk with some amount of fat in it ...

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 ...

Pig’s bladder, gypsum, fig sap, alum and onion juice — there’s no eye of newt among invisible ink recipes, but blood of dormouse is fair game. By the end of science historian Macrakis’ nearly ...