Nicholas Peleato lab2 (IMAGE) University of British Columbia Okanagan campus Caption Using a new method, UBCO researchers look for unique shapes of fluorescence signals in water. Each unique shape indicates the presence of impurities and helps researchers determine what the impurity is and distinguish it from other compounds. Credit UBC Okanagan 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.