Colored Cell Cultures (IMAGE) University of New South Wales Caption An imbalance of unstable molecular species called 'free radicals' will change the colour of cells. Credit Research co-author Martin Gosnell Quantitative Pty Ptd. Usage Restrictions Image may only be used in relation to this story and with appropriate caption and credit. 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.