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.

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 ...

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 KXAN Austin ...

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 WLNS 6 News ...

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.

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 KLFY.com ...

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 KELOLAND.com ...