Concrete Stress Testing (IMAGE) University of Leeds Caption A picture from a photonic camera showing how using the coating can create a candle-like 'flame' highlighting shear stress distribution in a sample concrete beam. Credit University of Leeds Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.