Monitoring sun exposure with a portable paper sensor

Summer is around the corner — time for cookouts and sunbathing. But too much sun can result in sunburn, which is the main cause of skin cancer. Because the time it takes to get burned depends on many factors, it is not easy to tell when to seek shade. To help people stay safe, researchers report the development of a paper-based sensor for monitoring sun exposure given different skin tones and sunscreen levels.