Hoang said the invisible ink pen could write on wood, metal and especially clothes. Furthermore, ... After 24 hours, the words that were written by those pens will completely disappear. The pen Hoang ...

I spy invisible ink pens that belong in the kids' stockings — snag a pack for $8 They have built-in UV lights and are suitable for children ages 3 and up, but you'll have fun using them too!

They have built-in UV lights and are suitable for children ages 3 and up, but you'll have fun using them too!

Geek Life: Fun stories, memes, humor and other random items at the intersection of tech, science, business and culture. SEE MORE Lines drawn with Living Ink’s algae pen disappear in about 10 ...

If you’ve got a spare printer ink cartridge and a document you only want one person to see—or just some free time and a cloak-and-dagger kick ... Fill a Used Print Cartridge with Invisible Ink.

Living Ink Technologies has a goal to raise $15,000 to fund the development of the first time-lapse ink, with shipments estimated to deliver in March 2016. It's raised $4,904 so far, with 43 days ...

Patents for ballpoint pens go back to the late 1800s, but it took half a century to develop good, fast-drying inks. Bic, Pilot, and other makers jealously guard their formulas, but to get that ...