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Which invisible ink pens are best? Spies and conspirators have used invisible inks for millennia to send messages. In the modern age, invisible ink pens are an excellent way for grown-ups to ...

Counterfeit detection pens may not provide reliable protection against sophisticated fake currency, according to Federal ...

A couple of years ago, a group of entrepreneurs successfully Kickstarted a little something known as the Chameleon Pen. In a nutshell, it's an art pen that changes color tone as you draw – for example ...

You want a pen that is comfortable to hold and writes smoothly, but not all pens are cut out for all types of paper. The best pens for Moleskines, for example, should meet certain criteria that differ ...

While the concept of applying ink to paper with a stylus can be traced back to ancient Egypt and China, the modern self-contained ink pen is a relatively new invention. Split quills gave way to metal ...