Researchers have developed a rewriteable paper coating that can encrypt secret information with relatively low-tech invisible ink -- water. A message printed out by a water-jet printer on a ...

eWeek content and product recommendations are editorially independent. We may make money when you click on links to our partners. Learn More Xerox said on Wednesday that its scientists have perfected ...

SAN DIEGO--(BUSINESS WIRE)--VersaCheck.com is pleased to announce the launch of the “Stealth™ iX” invisible ink printer series, based on new proprietary Stealth™ iX invisible printing technology. The ...

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 ...

A water soluble carbon nanodot ink produces bright long lasting invisible prints with micrometer scale detail and high accuracy for secure and low cost applications. Fluorescent inks fade quickly ...

Coded messages in invisible ink sound like something only found in espionage books, but in real life, they can have important security purposes. Yet, they can be cracked if their encryption is ...

Keeping track of vaccinations remains a major challenge in the developing world, and even in many developed countries, paperwork gets lost, and parents forget whether their child is up to date. Now a ...