Invisible ink pens are an excellent way for grown-ups to discreetly mark items in their workplace and a great toy for kids who want to play games. Skip to content. FOX31 Denver.

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!

Invisible ink pens are an excellent way for grown-ups to discreetly mark items in their workplace and a great toy for kids who want to play games. Skip to content. KRON4.

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—but the ...

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 ...

Locally, markers with ink that shows up only under an ultraviolet light are available for $3.53 at Fastenal Industrial Supplies in Gahanna, said George Speaks, a deputy director in the city's ...