Packaging warns of unsafe food

Researchers from Strathclyde University used new technology to create an "intelligent ink" to detect the presence of oxygen in packaged food. If the package seal is broken, either accidentally or by tampering, the ink changes colour. "If the seal is broken, oxygen is getting in, so the food may no longer be safe to eat. "Our technology has the potential to eliminate food poisoning due to bad packaging or tampering." The ink was created with light-sensitive nanoparticles, which can detect oxygen when triggered by ultraviolet light.

Source: 26 March 2007