In old movies and crime drama TV shows, the femme fatale's lipstick is a key piece of evidence to solve the crime. But Brian Bellott, a chemistry professor at Western Illinois University, knew that in the real world, it's not quite that easy. It's surprisingly difficult to identify a particular brand of lipstick because of what it's made of, and even when it's possible, lab tests take a while. Now Bellott and his team have created a simpler, cheaper process to test lipstick. The researchers presented their work today at a conference of the American Chemical Society in San Diego.