A team of researchers from Universidad Carlos III de Madrid (UC3M), the Massachusetts Institute of Technology (MIT) and Adobe ...

Deep in the center of our galaxy, scientists believe a strange type of star may be quietly glowing—not from fusion like our ...

In this challenge, I used a Smiggle Spy Pen to draw a full doodle using invisible ink that only appears under UV light! 🔦🖊️ Drawing without seeing the full lines in real time was tricky ...

The Cross Bailey Light Pen is crafted to weigh less than their other pens. It goes for $34 on the Cross site, although it’s currently on sale for $20 on Amazon. You can refill it with various types of ...

The erasable pens I remember using when I was in high school in the late 2000s were laughably bad. They required a lot of pressure to transfer ink to paper, and even then, the ink came out faded ...

A 110-year-old lemon used by a German WW1 spy to send secret messages from Britain with invisible ink is going on display in MI5’s first ever public exhibition. The blackened and flattened fruit ...

The tattoo firm, Bang Bang Tattoo, based in New York City, pioneered a special Magic Ink that’s only activated and visible when a UV light is shone over it, effectively turning the tattoo on and ...

And stocking stuffers should ideally cost below $20, so at just $8 for a six-pack, this set definitely fits the bill. Invisible ink pens are just as cool now as they were when we were kids. (Amazon) ...

Invisible ink, however, is neither secure nor share-proof. You can still reread the message as many times as you want, and they’re screenshottable.