Let's face it: How much sun is too much sun is, for most of us, one giant guessing game. We can use all the sunscreen we want and watch the clock like hawks, but the surest signs that we've had too much -- the pink burn, the blisters, the vomiting -- come well after the damage has been done.
Chemistry professors at the University of Strathclyde in Sweden hope to remove some of the guesswork with their UV-detecting wristband, which they plan to bring to market in 2013.
The device, which uses what is called UV dosimeter technology, relies on concepts that have been used in clinical research for years. An acid-release agent decomposes in sunlight, while a dye responds to pH levels, so that as sun exposure increases the color of the band gradually shifts from yellow to pink.… Read more