Fluorescence tuning (IMAGE) ETH Zurich Caption These polymers, seen here under UV light, are composed of the exact same components. The only difference is their chain length. Credit Suiying Ye / ETH Zurich 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.