From life-like faces to elaborate nature scenes, tattoos are a true art form. But the inks are unregulated in the U.S. Their chemical composition is a mystery, which means potential side effects are ...

An ink that changes colour when exposed to light, like an octopus does to match its surroundings, could one day be used for automatic camouflage. Most colour-changing inks and materials use chemical ...

Aura has also introduced Aura Ink, a cordless connected digital picture frame based on its latest full color E Ink Spectra 6 ...